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11s-6+13s=18+12s
We move all terms to the left:
11s-6+13s-(18+12s)=0
We add all the numbers together, and all the variables
11s+13s-(12s+18)-6=0
We add all the numbers together, and all the variables
24s-(12s+18)-6=0
We get rid of parentheses
24s-12s-18-6=0
We add all the numbers together, and all the variables
12s-24=0
We move all terms containing s to the left, all other terms to the right
12s=24
s=24/12
s=2
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