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6(3c-7)=78
We move all terms to the left:
6(3c-7)-(78)=0
We multiply parentheses
18c-42-78=0
We add all the numbers together, and all the variables
18c-120=0
We move all terms containing c to the left, all other terms to the right
18c=120
c=120/18
c=6+2/3
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