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8s+3(12+7s)=49
We move all terms to the left:
8s+3(12+7s)-(49)=0
We add all the numbers together, and all the variables
8s+3(7s+12)-49=0
We multiply parentheses
8s+21s+36-49=0
We add all the numbers together, and all the variables
29s-13=0
We move all terms containing s to the left, all other terms to the right
29s=13
s=13/29
s=13/29
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