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8(3s+2)=280
We move all terms to the left:
8(3s+2)-(280)=0
We multiply parentheses
24s+16-280=0
We add all the numbers together, and all the variables
24s-264=0
We move all terms containing s to the left, all other terms to the right
24s=264
s=264/24
s=11
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