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20=x+.5(x)
We move all terms to the left:
20-(x+.5(x))=0
We add all the numbers together, and all the variables
-(+1.5x)+20=0
We get rid of parentheses
-1.5x+20=0
We move all terms containing x to the left, all other terms to the right
-1.5x=-20
x=-20/-1.5
x=13+0.5/1.5
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