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12=s/4+8
We move all terms to the left:
12-(s/4+8)=0
We get rid of parentheses
-s/4-8+12=0
We multiply all the terms by the denominator
-s-8*4+12*4=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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