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-4=-12-s/8
We move all terms to the left:
-4-(-12-s/8)=0
We add all the numbers together, and all the variables
-(-s/8-12)-4=0
We get rid of parentheses
s/8+12-4=0
We multiply all the terms by the denominator
s+12*8-4*8=0
We add all the numbers together, and all the variables
s+64=0
We move all terms containing s to the left, all other terms to the right
s=-64
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