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14s-51=20s-81
We move all terms to the left:
14s-51-(20s-81)=0
We get rid of parentheses
14s-20s+81-51=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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