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12x-18=4x+6

We move all terms to the left:

12x-18-(4x+6)=0

We get rid of parentheses

12x-4x-6-18=0

We add all the numbers together, and all the variables

8x-24=0

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

8x=24

x=24/8

x=3

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