-21=3(c-83)

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Solution for -21=3(c-83) equation: 



-21=3(c-83)

We move all terms to the left:

-21-(3(c-83))=0



We calculate terms in parentheses: -(3(c-83)), so:

3(c-83)

We multiply parentheses

3c-249

Back to the equation:

-(3c-249)



We get rid of parentheses

-3c+249-21=0

We add all the numbers together, and all the variables

-3c+228=0

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

-3c=-228

c=-228/-3

c=+76

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