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500=x+0.2x
We move all terms to the left:
500-(x+0.2x)=0
We add all the numbers together, and all the variables
-(+1.2x)+500=0
We get rid of parentheses
-1.2x+500=0
We move all terms containing x to the left, all other terms to the right
-1.2x=-500
x=-500/-1.2
x=416+0.80000000000001/1.2
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