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-5s+3(5s+3)=126
We move all terms to the left:
-5s+3(5s+3)-(126)=0
We multiply parentheses
-5s+15s+9-126=0
We add all the numbers together, and all the variables
10s-117=0
We move all terms containing s to the left, all other terms to the right
10s=117
s=117/10
s=11+7/10
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