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7=s+-9
We move all terms to the left:
7-(s+-9)=0
We add all the numbers together, and all the variables
-(s-9)+7=0
We get rid of parentheses
-s+9+7=0
We add all the numbers together, and all the variables
-1s+16=0
We move all terms containing s to the left, all other terms to the right
-s=-16
s=-16/-1
s=+16
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