0=3c-21

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Solution for 0=3c-21 equation: 



0=3c-21

We move all terms to the left:

0-(3c-21)=0

We add all the numbers together, and all the variables

-(3c-21)=0

We get rid of parentheses

-3c+21=0

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

-3c=-21

c=-21/-3

c=+7

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