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x in (-oo:+oo)
x-((8/100)*x) = 500 // - 500
x-((8/100)*x)-500 = 0
x+(-2/25)*x-500 = 0
23/25*x-500 = 0 // + 500
23/25*x = 500 // : 23/25
x = 500/23/25
x = 12500/23
x = 12500/23
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