21=-3(x-9)

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Solution for 21=-3(x-9) equation: 



21=-3(x-9)

We move all terms to the left:

21-(-3(x-9))=0



We calculate terms in parentheses: -(-3(x-9)), so:

-3(x-9)

We multiply parentheses

-3x+27

Back to the equation:

-(-3x+27)



We get rid of parentheses

3x-27+21=0

We add all the numbers together, and all the variables

3x-6=0

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

3x=6

x=6/3

x=2

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