21=+3c=-4c+28

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Solution for 21=+3c=-4c+28 equation: 



21=+3c=-4c+28

We move all terms to the left:

21-(+3c)=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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