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4c-20=20-7c+15
We move all terms to the left:
4c-20-(20-7c+15)=0
We add all the numbers together, and all the variables
4c-(-7c+35)-20=0
We get rid of parentheses
4c+7c-35-20=0
We add all the numbers together, and all the variables
11c-55=0
We move all terms containing c to the left, all other terms to the right
11c=55
c=55/11
c=5
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