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70=7(s+3)
We move all terms to the left:
70-(7(s+3))=0
We calculate terms in parentheses: -(7(s+3)), so:We get rid of parentheses
7(s+3)
We multiply parentheses
7s+21
Back to the equation:
-(7s+21)
-7s-21+70=0
We add all the numbers together, and all the variables
-7s+49=0
We move all terms containing s to the left, all other terms to the right
-7s=-49
s=-49/-7
s=+7
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