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s+6+s+6+s+s+2s=120
We move all terms to the left:
s+6+s+6+s+s+2s-(120)=0
We add all the numbers together, and all the variables
6s-108=0
We move all terms containing s to the left, all other terms to the right
6s=108
s=108/6
s=18
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