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c/4+21=12
We move all terms to the left:
c/4+21-(12)=0
We add all the numbers together, and all the variables
c/4+9=0
We multiply all the terms by the denominator
c+9*4=0
We add all the numbers together, and all the variables
c+36=0
We move all terms containing c to the left, all other terms to the right
c=-36
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