3x+12=4x+9

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



3x+12=4x+9

We move all terms to the left:

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

We get rid of parentheses

3x-4x-9+12=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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