6x-3x-9=12

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Solution for 6x-3x-9=12 equation: 



6x-3x-9=12

We move all terms to the left:

6x-3x-9-(12)=0

We add all the numbers together, and all the variables

3x-21=0

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

3x=21

x=21/3

x=7

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