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c/12+9=18
We move all terms to the left:
c/12+9-(18)=0
We add all the numbers together, and all the variables
c/12-9=0
We multiply all the terms by the denominator
c-9*12=0
We add all the numbers together, and all the variables
c-108=0
We move all terms containing c to the left, all other terms to the right
c=108
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