3x-9=4x-12

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



3x-9=4x-12

We move all terms to the left:

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

We get rid of parentheses

3x-4x+12-9=0

We add all the numbers together, and all the variables

-1x+3=0

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

-x=-3

x=-3/-1

x=+3

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