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4x-12=x+-3x
We move all terms to the left:
4x-12-(x+-3x)=0
We add all the numbers together, and all the variables
4x-(-2x)-12=0
We get rid of parentheses
4x+2x-12=0
We add all the numbers together, and all the variables
6x-12=0
We move all terms containing x to the left, all other terms to the right
6x=12
x=12/6
x=2
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