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9(s-10)=-9
We move all terms to the left:
9(s-10)-(-9)=0
We add all the numbers together, and all the variables
9(s-10)+9=0
We multiply parentheses
9s-90+9=0
We add all the numbers together, and all the variables
9s-81=0
We move all terms containing s to the left, all other terms to the right
9s=81
s=81/9
s=9
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