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3s-18=18-3s
We move all terms to the left:
3s-18-(18-3s)=0
We add all the numbers together, and all the variables
3s-(-3s+18)-18=0
We get rid of parentheses
3s+3s-18-18=0
We add all the numbers together, and all the variables
6s-36=0
We move all terms containing s to the left, all other terms to the right
6s=36
s=36/6
s=6
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