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2(2x-20)=x-4
We move all terms to the left:
2(2x-20)-(x-4)=0
We multiply parentheses
4x-(x-4)-40=0
We get rid of parentheses
4x-x+4-40=0
We add all the numbers together, and all the variables
3x-36=0
We move all terms containing x to the left, all other terms to the right
3x=36
x=36/3
x=12
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