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39=3(s-78)
We move all terms to the left:
39-(3(s-78))=0
We calculate terms in parentheses: -(3(s-78)), so:We get rid of parentheses
3(s-78)
We multiply parentheses
3s-234
Back to the equation:
-(3s-234)
-3s+234+39=0
We add all the numbers together, and all the variables
-3s+273=0
We move all terms containing s to the left, all other terms to the right
-3s=-273
s=-273/-3
s=+91
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