9+x-4x=-12

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



9+x-4x=-12

We move all terms to the left:

9+x-4x-(-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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