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+(S-1)+(S-2)=108
We move all terms to the left:
+(S-1)+(S-2)-(108)=0
We get rid of parentheses
S+S-1-2-108=0
We add all the numbers together, and all the variables
2S-111=0
We move all terms containing S to the left, all other terms to the right
2S=111
S=111/2
S=55+1/2
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