3x+21=6x-6

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Solution for 3x+21=6x-6 equation: 



3x+21=6x-6

We move all terms to the left:

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

We get rid of parentheses

3x-6x+6+21=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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