9-9x=12x

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Solution for 9-9x=12x equation: 



9-9x=12x

We move all terms to the left:

9-9x-(12x)=0

We add all the numbers together, and all the variables

-21x+9=0

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

-21x=-9

x=-9/-21

x=3/7

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