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x+2(x-4)=2x-1
We move all terms to the left:
x+2(x-4)-(2x-1)=0
We multiply parentheses
x+2x-(2x-1)-8=0
We get rid of parentheses
x+2x-2x+1-8=0
We add all the numbers together, and all the variables
x-7=0
We move all terms containing x to the left, all other terms to the right
x=7
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