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4c=2c-30
We move all terms to the left:
4c-(2c-30)=0
We get rid of parentheses
4c-2c+30=0
We add all the numbers together, and all the variables
2c+30=0
We move all terms containing c to the left, all other terms to the right
2c=-30
c=-30/2
c=-15
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