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3(4-x)+6x)=4x+12-x
We move all terms to the left:
3(4-x)+6x)-(4x+12-x)=0
We add all the numbers together, and all the variables
3(-1x+4)+6x)-(+3x)+12=0
We multiply parentheses
-3x+6x)-(+3x)+12+12=0
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