3c+9c=6c+42

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Solution for 3c+9c=6c+42 equation: 



3c+9c=6c+42

We move all terms to the left:

3c+9c-(6c+42)=0

We add all the numbers together, and all the variables

12c-(6c+42)=0

We get rid of parentheses

12c-6c-42=0

We add all the numbers together, and all the variables

6c-42=0

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

6c=42

c=42/6

c=7

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