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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1960000/x = 1.2 // - 1.2
1960000/x-1.2 = 0
1960000*x^-1 = 1.2 // : 1960000
x^-1 = 0.00000061
-1 < 0
1/(x^1) = 0.00000061 // * x^1
1 = 0.00000061*x^1 // : 0.00000061
1639344.26229508 = x^1
x = 1639344.26229508
x = 1639344.26229508
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