Question

2x-9+10+3x-9

Answer 1

Combine like terms and get 5x-8. The set equal to zero.
Then add 8 to both sides.
5x-8=0
+8 +8
5x=8
Divide both sides by 5
5x = 8
/5 /5
x=8/5

Answer 2

where yu get 8 from

Answer 3

When you combine the like terms. you add the 2x and 3x together, 5x. Then you combine the -9+10-9, which equals -8. so 5x-8, then set it all to zero to solve for x.

Answer 4

Did you figure it out?

Answer 5

If you are not solving for x and just need to simplify the expression, you just need to combine like terms.

2x-9+10+3x-9

I try to group the terms together but respect the signs that are in front of them, it makes it a little easier to read.

2x+3x=5x

-9+10=1
1-9=-8

So you now have a +5x and a -8. Mash them back together into an expression respecting the signs that precede the number.

5x-8

If you were to solve for x, you need to make the expression equal to 0.

5x-8=0

You can't solve for x like this so you need to move the 8 to the other side.

5x-8+8=0+8

The 8s on the left cancel and you are adding 8 to the right side.

5x=8

Now you have to divide to get x 'alone'.

5x/5=8/5

The 5s will cancel leaving x 'alone'.

x=8/5

Now, to check your work, plug into the place the fraction 8/5.

5*8/5-8=0

Combine the like terms and they should equal 0. So the expression will be true. If they do not equal zero, something in your math is wrong.