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13s+2=11s+12
We move all terms to the left:
13s+2-(11s+12)=0
We get rid of parentheses
13s-11s-12+2=0
We add all the numbers together, and all the variables
2s-10=0
We move all terms containing s to the left, all other terms to the right
2s=10
s=10/2
s=5
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