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4(x-1)-2x=12
We move all terms to the left:
4(x-1)-2x-(12)=0
We add all the numbers together, and all the variables
-2x+4(x-1)-12=0
We multiply parentheses
-2x+4x-4-12=0
We add all the numbers together, and all the variables
2x-16=0
We move all terms containing x to the left, all other terms to the right
2x=16
x=16/2
x=8
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