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Question

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anonymous · Answer

x=30-25
=5

solomonzelman · Answer

$\huge\color{blue}{  \rm S    }$  
$\huge\color{blue}{  \rm S    }$ $\normalsize\color{ slate }{\Huge{\bbox[5pt, lightcyan ,border:2px solid  black  ]{   \color{lightcyan}{\Huge\frac{~~\frac{~}{~~~\frac{~\frac{}{}~}{~\frac{~}{~}}~~~~}~~~}{~\frac{\frac{~}{~\frac{~\frac{}{~}}{~}}~~}{~}~~} }  }}}$ $\huge\color{blue}{  \rm S    }$  
                        $\huge\color{blue}{  \rm S    }$ 

$\huge\color{blue}{  \rm Perimeter~of~a~square =  4\times s  }$            ("s" is juts a side)

solomonzelman · Answer

this is because all sides of a square are equal.

solomonzelman · Answer

Now, you know that a side of a square is $\large\color{slate}{   7x+3   }$
yes yes... 

$\large\color{slate}{  4( 7x+3 )= 25x+30 }$

solomonzelman · Answer

that is the set up, b/c `25x+30` is the perimeter.

solomonzelman · Answer

and your perimeter is equal to the "side times 4"
So we are setting that up,  P=4 * s, BUT we are now actually plugging the value of your perimeter (P) and the value of the side (s).

anonymous · Answer

im confussed

solomonzelman · Answer

why?

anonymous · Answer

how di u get 12

solomonzelman · Answer

oh,Pandeee_ expanded the parenthesis on the left side:

solomonzelman · Answer

anyway, so

$\large\color{slate}{  4( 7x+3 )= 25x+30 }$

$\large\color{slate}{  28x+12= 25x+30 }$  (as you already said for the left side)

solomonzelman · Answer

Pandeee_ , do you understand what is being done?

anonymous · Answer

oh ok

solomonzelman · Answer

so can you find the "x" ?

solomonzelman · Answer

Shirtcut the math , lol....

$\large\color{slate}{  28x+12\color{red}{-25x+12}= 25x+30\color{red}{-25x+12} }$

solomonzelman · Answer

I am subtracting the red from both sides, and what will this give me?

solomonzelman · Answer

yes, but,

$\large\color{slate}{  28x+12\color{red}{-25x+12}= 25x+30\color{red}{-25x+12} }$

$\large\color{slate}{  25x\color{blue}{+3x}+12\color{red}{-25x+12}= 25x+12\color{blue}{+18}\color{red}{-25x+12} }$

solomonzelman · Answer

oh I forgot parenthesis

solomonzelman · Answer

$\large\color{slate}{    28x+12=25x+30               }$  you expression we are at.

$\large\color{slate}{    28x+12\color{red}{-25x-12}=25x+30\color{red}{-25x-12}                }$

solomonzelman · Answer

i wrote that we are adding 12 to both sides, but we are not. We are subtracting 12 from both sides.

solomonzelman · Answer

I am subtracting the `smaller term with variable` together with the `smaller constant` from both sides.

solomonzelman · Answer

30-12 = ?

solomonzelman · Answer

yes

solomonzelman · Answer

3x=18
so, x=?

solomonzelman · Answer

yes

solomonzelman · Answer

Not a problem:)