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39=4s+7
We move all terms to the left:
39-(4s+7)=0
We get rid of parentheses
-4s-7+39=0
We add all the numbers together, and all the variables
-4s+32=0
We move all terms containing s to the left, all other terms to the right
-4s=-32
s=-32/-4
s=+8
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