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c/3=-7
We move all terms to the left:
c/3-(-7)=0
We add all the numbers together, and all the variables
c/3+7=0
We multiply all the terms by the denominator
c+7*3=0
We add all the numbers together, and all the variables
c+21=0
We move all terms containing c to the left, all other terms to the right
c=-21
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