12=-5x+8x-9

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Solution for 12=-5x+8x-9 equation: 



12=-5x+8x-9

We move all terms to the left:

12-(-5x+8x-9)=0

We add all the numbers together, and all the variables

-(3x-9)+12=0

We get rid of parentheses

-3x+9+12=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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