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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.8 = 2000000/x // - 2000000/x
0.8-(2000000/x) = 0
0.8-2000000*x^-1 = 0
-2000000*x^-1 = -0.8 // : -2000000
x^-1 = 0.0000004
-1 < 0
1/(x^1) = 0.0000004 // * x^1
1 = 0.0000004*x^1 // : 0.0000004
2500000 = x^1
x = 2500000
x = 2500000
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