12-21=4x-6x+5x

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Solution for 12-21=4x-6x+5x equation: 



12-21=4x-6x+5x

We move all terms to the left:

12-21-(4x-6x+5x)=0

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-(+3x)-9=0

We get rid of parentheses

-3x-9=0

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

-3x=9

x=9/-3

x=-3

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