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-4+16s=9(3s-20)
We move all terms to the left:
-4+16s-(9(3s-20))=0
We calculate terms in parentheses: -(9(3s-20)), so:We get rid of parentheses
9(3s-20)
We multiply parentheses
27s-180
Back to the equation:
-(27s-180)
16s-27s+180-4=0
We add all the numbers together, and all the variables
-11s+176=0
We move all terms containing s to the left, all other terms to the right
-11s=-176
s=-176/-11
s=+16
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