3x-12=x+9

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



3x-12=x+9

We move all terms to the left:

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

We get rid of parentheses

3x-x-9-12=0

We add all the numbers together, and all the variables

2x-21=0

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

2x=21

x=21/2

x=10+1/2

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