9=-7-8x

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Solution for 9=-7-8x equation: 



9=-7-8x

We move all terms to the left:

9-(-7-8x)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

8x+7+9=0

We add all the numbers together, and all the variables

8x+16=0

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

8x=-16

x=-16/8

x=-2

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