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12+2s=151.5
We move all terms to the left:
12+2s-(151.5)=0
We add all the numbers together, and all the variables
2s-139.5=0
We move all terms containing s to the left, all other terms to the right
2s=139.5
s=139.5/2
s=69+1/1.3333333333333
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