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2(1+s)=18
We move all terms to the left:
2(1+s)-(18)=0
We add all the numbers together, and all the variables
2(s+1)-18=0
We multiply parentheses
2s+2-18=0
We add all the numbers together, and all the variables
2s-16=0
We move all terms containing s to the left, all other terms to the right
2s=16
s=16/2
s=8
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