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9+3=7S-3
We move all terms to the left:
9+3-(7S-3)=0
We add all the numbers together, and all the variables
-(7S-3)+12=0
We get rid of parentheses
-7S+3+12=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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