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20=2x+1(2x)
We move all terms to the left:
20-(2x+1(2x))=0
We add all the numbers together, and all the variables
-(+14x)+20=0
We get rid of parentheses
-14x+20=0
We move all terms containing x to the left, all other terms to the right
-14x=-20
x=-20/-14
x=1+3/7
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