12c+9-3c=2c+30

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Solution for 12c+9-3c=2c+30 equation: 



12c+9-3c=2c+30

We move all terms to the left:

12c+9-3c-(2c+30)=0

We add all the numbers together, and all the variables

9c-(2c+30)+9=0

We get rid of parentheses

9c-2c-30+9=0

We add all the numbers together, and all the variables

7c-21=0

We move all terms containing c to the left, all other terms to the right

7c=21

c=21/7

c=3

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