21=c-6-4c

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Solution for 21=c-6-4c equation: 



21=c-6-4c

We move all terms to the left:

21-(c-6-4c)=0

We add all the numbers together, and all the variables

-(-3c-6)+21=0

We get rid of parentheses

3c+6+21=0

We add all the numbers together, and all the variables

3c+27=0

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

3c=-27

c=-27/3

c=-9

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