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s=6s-90
We move all terms to the left:
s-(6s-90)=0
We get rid of parentheses
s-6s+90=0
We add all the numbers together, and all the variables
-5s+90=0
We move all terms containing s to the left, all other terms to the right
-5s=-90
s=-90/-5
s=+18
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