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c=15.5+12(3)
We move all terms to the left:
c-(15.5+12(3))=0
We add all the numbers together, and all the variables
c-(138.5)=0
We add all the numbers together, and all the variables
c-138.5=0
We move all terms containing c to the left, all other terms to the right
c=138.5
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