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18.61+13.8s=12.6s-2.63
We move all terms to the left:
18.61+13.8s-(12.6s-2.63)=0
We get rid of parentheses
13.8s-12.6s+2.63+18.61=0
We add all the numbers together, and all the variables
1.2s+21.24=0
We move all terms containing s to the left, all other terms to the right
1.2s=-21.24
s=-21.24/1.2
s=-17+0.84/1.2
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