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x+(x-0.20x)+(x+0.22x)=500
We move all terms to the left:
x+(x-0.20x)+(x+0.22x)-(500)=0
We add all the numbers together, and all the variables
x+(+0.8x)+(+1.22x)-500=0
We get rid of parentheses
x+0.8x+1.22x-500=0
We add all the numbers together, and all the variables
3.02x-500=0
We move all terms containing x to the left, all other terms to the right
3.02x=500
x=500/3.02
x=165+1/1.77647058824
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