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x+2(x-8)=x+20
We move all terms to the left:
x+2(x-8)-(x+20)=0
We multiply parentheses
x+2x-(x+20)-16=0
We get rid of parentheses
x+2x-x-20-16=0
We add all the numbers together, and all the variables
2x-36=0
We move all terms containing x to the left, all other terms to the right
2x=36
x=36/2
x=18
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