3x-6+3x=12

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



3x-6+3x=12

We move all terms to the left:

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

We add all the numbers together, and all the variables

6x-18=0

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

6x=18

x=18/6

x=3

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