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4=15-3S
We move all terms to the left:
4-(15-3S)=0
We add all the numbers together, and all the variables
-(-3S+15)+4=0
We get rid of parentheses
3S-15+4=0
We add all the numbers together, and all the variables
3S-11=0
We move all terms containing S to the left, all other terms to the right
3S=11
S=11/3
S=3+2/3
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