0.26(x+40)+0.37(x+20)=-20

Question

tkhunny · Answer

Were you planning to solve that?  Let's see it!

anonymous · Answer

@tkhunny i dont know how to. i got the wrong answer i just want to see the steps. can you help me?

tkhunny · Answer

Doesn't work that way.  Prove that you can do SOEMTHING.

0.26(x+40)+0.37(x+20)=-20

Do one piece at a time.

0.26(x+40)

Can you expand that?

anonymous · Answer

.26x+10.4

anonymous · Answer

@tkhunny

tkhunny · Answer

Perfect.  Now the next piece.

0.37(x+20)

anonymous · Answer

@tkhunny .37x + 7.4

tkhunny · Answer

There you have it.  Which part of that could you not do previously?  Now add them all up!

0.26x + 10.4 +  0.37x + 7.4

anonymous · Answer

@tkhunny 
3+0.11x=-20
-3                -3
0.11x=-23
divide 0.11x
x=-209

tkhunny · Answer

0.26x + 0.37x = 0.63x
10.4 + 7.4 = 17.8

Why are you feeling a need to subtract?  Did you write the problem statement incorrectly?

anonymous · Answer

@tkhunny ohhhhh okay thank you i get it. can you help me get through other ones please?

anonymous · Answer

2/5x-1/3x=2 @tkhunny

tkhunny · Answer

You'll have to be more clear.  is "2/5x" this $\dfrac{2}{5x}$ or this$\dfrac{2}{5}x$?  Use parentheses to be clear.

anonymous · Answer

$$\frac{ 2 }{ 5 }x$$

anonymous · Answer

@tkhunny

tkhunny · Answer

Now we add fractions?  Denominators are 5 and 3.  Go!