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x in (-oo:+oo)
0.3 = 500000-(x/500000) // - 500000-(x/500000)
x/500000-500000+0.3 = 0
1/500000*x-499999.7 = 0 // + 499999.7
1/500000*x = 499999.7 // : 1/500000
x = 499999.7/1/500000
x = 249999850000
x = 249999850000
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