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77=7(s+1)
We move all terms to the left:
77-(7(s+1))=0
We calculate terms in parentheses: -(7(s+1)), so:We get rid of parentheses
7(s+1)
We multiply parentheses
7s+7
Back to the equation:
-(7s+7)
-7s-7+77=0
We add all the numbers together, and all the variables
-7s+70=0
We move all terms containing s to the left, all other terms to the right
-7s=-70
s=-70/-7
s=+10
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