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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.9 = 1350000/x // - 1350000/x
2.9-(1350000/x) = 0
2.9-1350000*x^-1 = 0
-1350000*x^-1 = -2.9 // : -1350000
x^-1 = 0.00000215
-1 < 0
1/(x^1) = 0.00000215 // * x^1
1 = 0.00000215*x^1 // : 0.00000215
465116.27906977 = x^1
x = 465116.27906977
x = 465116.27906977
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