c+15=3c-21

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Solution for c+15=3c-21 equation: 



c+15=3c-21

We move all terms to the left:

c+15-(3c-21)=0

We get rid of parentheses

c-3c+21+15=0

We add all the numbers together, and all the variables

-2c+36=0

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

-2c=-36

c=-36/-2

c=+18

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