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-12=s/2+-8
We move all terms to the left:
-12-(s/2+-8)=0
We add all the numbers together, and all the variables
-(s/2-8)-12=0
We get rid of parentheses
-s/2+8-12=0
We multiply all the terms by the denominator
-s+8*2-12*2=0
We add all the numbers together, and all the variables
-1s-8=0
We move all terms containing s to the left, all other terms to the right
-s=8
s=8/-1
s=-8
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