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13=2s-7
We move all terms to the left:
13-(2s-7)=0
We get rid of parentheses
-2s+7+13=0
We add all the numbers together, and all the variables
-2s+20=0
We move all terms containing s to the left, all other terms to the right
-2s=-20
s=-20/-2
s=+10
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