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12=s/3+10
We move all terms to the left:
12-(s/3+10)=0
We get rid of parentheses
-s/3-10+12=0
We multiply all the terms by the denominator
-s-10*3+12*3=0
We add all the numbers together, and all the variables
-1s+6=0
We move all terms containing s to the left, all other terms to the right
-s=-6
s=-6/-1
s=+6
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