X+9=4x+12

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



X+9=4X+12

We move all terms to the left:

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

We get rid of parentheses

X-4X-12+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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