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2x-4(-x+4)=20
We move all terms to the left:
2x-4(-x+4)-(20)=0
We add all the numbers together, and all the variables
2x-4(-1x+4)-20=0
We multiply parentheses
2x+4x-16-20=0
We add all the numbers together, and all the variables
6x-36=0
We move all terms containing x to the left, all other terms to the right
6x=36
x=36/6
x=6
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