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66=6(20+s)
We move all terms to the left:
66-(6(20+s))=0
We add all the numbers together, and all the variables
-(6(s+20))+66=0
We calculate terms in parentheses: -(6(s+20)), so:We get rid of parentheses
6(s+20)
We multiply parentheses
6s+120
Back to the equation:
-(6s+120)
-6s-120+66=0
We add all the numbers together, and all the variables
-6s-54=0
We move all terms containing s to the left, all other terms to the right
-6s=54
s=54/-6
s=-9
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