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5c-30=2c+30
We move all terms to the left:
5c-30-(2c+30)=0
We get rid of parentheses
5c-2c-30-30=0
We add all the numbers together, and all the variables
3c-60=0
We move all terms containing c to the left, all other terms to the right
3c=60
c=60/3
c=20
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