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-c/9-42=30
We move all terms to the left:
-c/9-42-(30)=0
We add all the numbers together, and all the variables
-c/9-72=0
We multiply all the terms by the denominator
-c-72*9=0
We add all the numbers together, and all the variables
-1c-648=0
We move all terms containing c to the left, all other terms to the right
-c=648
c=648/-1
c=-648
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