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(2s+2)+(3s-2)=90
We move all terms to the left:
(2s+2)+(3s-2)-(90)=0
We get rid of parentheses
2s+3s+2-2-90=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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