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3c-15=4c+20
We move all terms to the left:
3c-15-(4c+20)=0
We get rid of parentheses
3c-4c-20-15=0
We add all the numbers together, and all the variables
-1c-35=0
We move all terms containing c to the left, all other terms to the right
-c=35
c=35/-1
c=-35
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