7+8x=9x-20

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Solution for 7+8x=9x-20 equation: 



7+8x=9x-20

We move all terms to the left:

7+8x-(9x-20)=0

We get rid of parentheses

8x-9x+20+7=0

We add all the numbers together, and all the variables

-1x+27=0

We move all terms containing x to the left, all other terms to the right

-x=-27

x=-27/-1

x=+27

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