21-12=3(x-6)

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Solution for 21-12=3(x-6) equation: 



21-12=3(x-6)

We move all terms to the left:

21-12-(3(x-6))=0

We add all the numbers together, and all the variables

-(3(x-6))+9=0



We calculate terms in parentheses: -(3(x-6)), so:

3(x-6)

We multiply parentheses

3x-18

Back to the equation:

-(3x-18)



We get rid of parentheses

-3x+18+9=0

We add all the numbers together, and all the variables

-3x+27=0

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

-3x=-27

x=-27/-3

x=+9

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