2x+9-4x=x-12

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Solution for 2x+9-4x=x-12 equation: 



2x+9-4x=x-12

We move all terms to the left:

2x+9-4x-(x-12)=0

We add all the numbers together, and all the variables

-2x-(x-12)+9=0

We get rid of parentheses

-2x-x+12+9=0

We add all the numbers together, and all the variables

-3x+21=0

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

-3x=-21

x=-21/-3

x=+7

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