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12s+4+8s=13s-10
We move all terms to the left:
12s+4+8s-(13s-10)=0
We add all the numbers together, and all the variables
20s-(13s-10)+4=0
We get rid of parentheses
20s-13s+10+4=0
We add all the numbers together, and all the variables
7s+14=0
We move all terms containing s to the left, all other terms to the right
7s=-14
s=-14/7
s=-2
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