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8s+3(12-7s)=-28
We move all terms to the left:
8s+3(12-7s)-(-28)=0
We add all the numbers together, and all the variables
8s+3(-7s+12)-(-28)=0
We add all the numbers together, and all the variables
8s+3(-7s+12)+28=0
We multiply parentheses
8s-21s+36+28=0
We add all the numbers together, and all the variables
-13s+64=0
We move all terms containing s to the left, all other terms to the right
-13s=-64
s=-64/-13
s=4+12/13
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