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(3s-2)+(4s-6)=90
We move all terms to the left:
(3s-2)+(4s-6)-(90)=0
We get rid of parentheses
3s+4s-2-6-90=0
We add all the numbers together, and all the variables
7s-98=0
We move all terms containing s to the left, all other terms to the right
7s=98
s=98/7
s=14
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