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(2x-6)+(4x-12)=
We move all terms to the left:
(2x-6)+(4x-12)-()=0
We add all the numbers together, and all the variables
(2x-6)+(4x-12)=0
We get rid of parentheses
2x+4x-6-12=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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