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4(4s+1)=84
We move all terms to the left:
4(4s+1)-(84)=0
We multiply parentheses
16s+4-84=0
We add all the numbers together, and all the variables
16s-80=0
We move all terms containing s to the left, all other terms to the right
16s=80
s=80/16
s=5
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