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=(12S-40)+(3S-13)
We move all terms to the left:
-((12S-40)+(3S-13))=0
We calculate terms in parentheses: -((12S-40)+(3S-13)), so:We get rid of parentheses
(12S-40)+(3S-13)
We get rid of parentheses
12S+3S-40-13
We add all the numbers together, and all the variables
15S-53
Back to the equation:
-(15S-53)
-15S+53=0
We move all terms containing S to the left, all other terms to the right
-15S=-53
S=-53/-15
S=3+8/15
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