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-12+4c=6c-30
We move all terms to the left:
-12+4c-(6c-30)=0
We get rid of parentheses
4c-6c+30-12=0
We add all the numbers together, and all the variables
-2c+18=0
We move all terms containing c to the left, all other terms to the right
-2c=-18
c=-18/-2
c=+9
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