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s=3s-72
We move all terms to the left:
s-(3s-72)=0
We get rid of parentheses
s-3s+72=0
We add all the numbers together, and all the variables
-2s+72=0
We move all terms containing s to the left, all other terms to the right
-2s=-72
s=-72/-2
s=+36
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