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2s+s+12=132.
We move all terms to the left:
2s+s+12-(132.)=0
We add all the numbers together, and all the variables
2s+s+12-132=0
We add all the numbers together, and all the variables
3s-120=0
We move all terms containing s to the left, all other terms to the right
3s=120
s=120/3
s=40
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