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3(4s+1)=15
We move all terms to the left:
3(4s+1)-(15)=0
We multiply parentheses
12s+3-15=0
We add all the numbers together, and all the variables
12s-12=0
We move all terms containing s to the left, all other terms to the right
12s=12
s=12/12
s=1
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