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(3c-12)=-9
We move all terms to the left:
(3c-12)-(-9)=0
We add all the numbers together, and all the variables
(3c-12)+9=0
We get rid of parentheses
3c-12+9=0
We add all the numbers together, and all the variables
3c-3=0
We move all terms containing c to the left, all other terms to the right
3c=3
c=3/3
c=1
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