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500=x+0.20x+0.22x
We move all terms to the left:
500-(x+0.20x+0.22x)=0
We add all the numbers together, and all the variables
-(+1.42x)+500=0
We get rid of parentheses
-1.42x+500=0
We move all terms containing x to the left, all other terms to the right
-1.42x=-500
x=-500/-1.42
x=352+0.16/1.42
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