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56+(4s+8)=90
We move all terms to the left:
56+(4s+8)-(90)=0
We add all the numbers together, and all the variables
(4s+8)-34=0
We get rid of parentheses
4s+8-34=0
We add all the numbers together, and all the variables
4s-26=0
We move all terms containing s to the left, all other terms to the right
4s=26
s=26/4
s=6+1/2
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