21=3(c-)

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Solution for 21=3(c-) equation: 



21=3(c-)

We move all terms to the left:

21-(3(c-))=0

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(3(+c)), so:

3(+c)

We multiply parentheses

3c

Back to the equation:

-(3c)



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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