12=9+4x

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Solution for 12=9+4x equation: 



12=9+4x

We move all terms to the left:

12-(9+4x)=0

We add all the numbers together, and all the variables

-(4x+9)+12=0

We get rid of parentheses

-4x-9+12=0

We add all the numbers together, and all the variables

-4x+3=0

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

-4x=-3

x=-3/-4

x=3/4

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