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2(4s+1)=42
We move all terms to the left:
2(4s+1)-(42)=0
We multiply parentheses
8s+2-42=0
We add all the numbers together, and all the variables
8s-40=0
We move all terms containing s to the left, all other terms to the right
8s=40
s=40/8
s=5
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