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12s-10=6s+20
We move all terms to the left:
12s-10-(6s+20)=0
We get rid of parentheses
12s-6s-20-10=0
We add all the numbers together, and all the variables
6s-30=0
We move all terms containing s to the left, all other terms to the right
6s=30
s=30/6
s=5
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