63=21+6c

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Solution for 63=21+6c equation: 



63=21+6c

We move all terms to the left:

63-(21+6c)=0

We add all the numbers together, and all the variables

-(6c+21)+63=0

We get rid of parentheses

-6c-21+63=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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