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c/7-3=21
We move all terms to the left:
c/7-3-(21)=0
We add all the numbers together, and all the variables
c/7-24=0
We multiply all the terms by the denominator
c-24*7=0
We add all the numbers together, and all the variables
c-168=0
We move all terms containing c to the left, all other terms to the right
c=168
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