3x-12=9-4x

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Solution for 3x-12=9-4x equation: 



3x-12=9-4x

We move all terms to the left:

3x-12-(9-4x)=0

We add all the numbers together, and all the variables

3x-(-4x+9)-12=0

We get rid of parentheses

3x+4x-9-12=0

We add all the numbers together, and all the variables

7x-21=0

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

7x=21

x=21/7

x=3

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