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(4s+8)+54=90
We move all terms to the left:
(4s+8)+54-(90)=0
We add all the numbers together, and all the variables
(4s+8)-36=0
We get rid of parentheses
4s+8-36=0
We add all the numbers together, and all the variables
4s-28=0
We move all terms containing s to the left, all other terms to the right
4s=28
s=28/4
s=7
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