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

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



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

We move all terms to the left:

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

We multiply parentheses

-3x-(3x-21)-27=0

We get rid of parentheses

-3x-3x+21-27=0

We add all the numbers together, and all the variables

-6x-6=0

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

-6x=6

x=6/-6

x=-1

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