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D( x )
x-750000 = 0
x-750000 = 0
x-750000 = 0
x-750000 = 0 // + 750000
x = 750000
x in (-oo:750000) U (750000:+oo)
2250000 = x/(x-750000) // - x/(x-750000)
2250000-(x/(x-750000)) = 0
(-1*x)/(x-750000)+2250000 = 0
(-1*x)/(x-750000)+(2250000*(x-750000))/(x-750000) = 0
2250000*(x-750000)-1*x = 0
2249999*x-1687500000000 = 0
(2249999*x-1687500000000)/(x-750000) = 0
(2249999*x-1687500000000)/(x-750000) = 0 // * x-750000
2249999*x-1687500000000 = 0
2249999*x-1687500000000 = 0 // + 1687500000000
2249999*x = 1687500000000 // : 2249999
x = 1687500000000/2249999
x = 1687500000000/2249999
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