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520=x+.20x
We move all terms to the left:
520-(x+.20x)=0
We add all the numbers together, and all the variables
-(+1.2x)+520=0
We get rid of parentheses
-1.2x+520=0
We move all terms containing x to the left, all other terms to the right
-1.2x=-520
x=-520/-1.2
x=433+0.4/1.2
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