12-x+4x=9

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



12-x+4x=9

We move all terms to the left:

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

We add all the numbers together, and all the variables

3x+3=0

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

3x=-3

x=-3/3

x=-1

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