21-42=3(x-2)-3

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Solution for 21-42=3(x-2)-3 equation: 



21-42=3(x-2)-3

We move all terms to the left:

21-42-(3(x-2)-3)=0

We add all the numbers together, and all the variables

-(3(x-2)-3)-21=0



We calculate terms in parentheses: -(3(x-2)-3), so:

3(x-2)-3

We multiply parentheses

3x-6-3

We add all the numbers together, and all the variables

3x-9

Back to the equation:

-(3x-9)



We get rid of parentheses

-3x+9-21=0

We add all the numbers together, and all the variables

-3x-12=0

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

-3x=12

x=12/-3

x=-4

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