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10s+15=3s-20
We move all terms to the left:
10s+15-(3s-20)=0
We get rid of parentheses
10s-3s+20+15=0
We add all the numbers together, and all the variables
7s+35=0
We move all terms containing s to the left, all other terms to the right
7s=-35
s=-35/7
s=-5
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