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(3S-5)=215
We move all terms to the left:
(3S-5)-(215)=0
We get rid of parentheses
3S-5-215=0
We add all the numbers together, and all the variables
3S-220=0
We move all terms containing S to the left, all other terms to the right
3S=220
S=220/3
S=73+1/3
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