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+15S=15+8S
We move all terms to the left:
+15S-(15+8S)=0
We add all the numbers together, and all the variables
15S-(8S+15)=0
We get rid of parentheses
15S-8S-15=0
We add all the numbers together, and all the variables
7S-15=0
We move all terms containing S to the left, all other terms to the right
7S=15
S=15/7
S=2+1/7
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