9=12+4x

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Solution for 9=12+4x equation: 



9=12+4x

We move all terms to the left:

9-(12+4x)=0

We add all the numbers together, and all the variables

-(4x+12)+9=0

We get rid of parentheses

-4x-12+9=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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