7s-7(s+9)=-9s

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Solution for 7s-7(s+9)=-9s equation: 



7s-7(s+9)=-9s

We move all terms to the left:

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

We multiply parentheses

7s-7s-(-9s)-63=0

We get rid of parentheses

7s-7s+9s-63=0

We add all the numbers together, and all the variables

9s-63=0

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

9s=63

s=63/9

s=7

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