-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

-1x-(-4x+12)-9=0

We get rid of parentheses

-1x+4x-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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