-7s-8=-9s

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Solution for -7s-8=-9s equation: 



-7s-8=-9s

We move all terms to the left:

-7s-8-(-9s)=0

We get rid of parentheses

-7s+9s-8=0

We add all the numbers together, and all the variables

2s-8=0

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

2s=8

s=8/2

s=4

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