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4x+2(x-1)=12
We move all terms to the left:
4x+2(x-1)-(12)=0
We multiply parentheses
4x+2x-2-12=0
We add all the numbers together, and all the variables
6x-14=0
We move all terms containing x to the left, all other terms to the right
6x=14
x=14/6
x=2+1/3
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