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13+2(4s-3)=-1
We move all terms to the left:
13+2(4s-3)-(-1)=0
We add all the numbers together, and all the variables
2(4s-3)+14=0
We multiply parentheses
8s-6+14=0
We add all the numbers together, and all the variables
8s+8=0
We move all terms containing s to the left, all other terms to the right
8s=-8
s=-8/8
s=-1
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