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(s+6)+(s+6)+2s+s+s=102
We move all terms to the left:
(s+6)+(s+6)+2s+s+s-(102)=0
We add all the numbers together, and all the variables
4s+(s+6)+(s+6)-102=0
We get rid of parentheses
4s+s+s+6+6-102=0
We add all the numbers together, and all the variables
6s-90=0
We move all terms containing s to the left, all other terms to the right
6s=90
s=90/6
s=15
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