21=c+6c

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Solution for 21=c+6c equation: 



21=c+6c

We move all terms to the left:

21-(c+6c)=0

We add all the numbers together, and all the variables

-(+7c)+21=0

We get rid of parentheses

-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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