21=(c-9)

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Solution for 21=(c-9) equation: 



21=(c-9)

We move all terms to the left:

21-((c-9))=0



We calculate terms in parentheses: -((c-9)), so:

(c-9)

We get rid of parentheses

c-9

Back to the equation:

-(c-9)



We get rid of parentheses

-c+9+21=0

We add all the numbers together, and all the variables

-1c+30=0

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

-c=-30

c=-30/-1

c=+30

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