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15=2(s-12)+7
We move all terms to the left:
15-(2(s-12)+7)=0
We calculate terms in parentheses: -(2(s-12)+7), so:We get rid of parentheses
2(s-12)+7
We multiply parentheses
2s-24+7
We add all the numbers together, and all the variables
2s-17
Back to the equation:
-(2s-17)
-2s+17+15=0
We add all the numbers together, and all the variables
-2s+32=0
We move all terms containing s to the left, all other terms to the right
-2s=-32
s=-32/-2
s=+16
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