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-6c-(-42c)+(-28c)=24
We move all terms to the left:
-6c-(-42c)+(-28c)-(24)=0
We get rid of parentheses
-6c+42c-28c-24=0
We add all the numbers together, and all the variables
8c-24=0
We move all terms containing c to the left, all other terms to the right
8c=24
c=24/8
c=3
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