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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2000000/950000 = 3000000/x // - 3000000/x
2000000/950000-(3000000/x) = 0
2000000/950000-3000000*x^-1 = 0
-3000000*x^-1 = -40/19 // : -3000000
x^-1 = 1/1425000
-1 < 0
1/(x^1) = 1/1425000 // * x^1
1 = 1/1425000*x^1 // : 1/1425000
1425000 = x^1
x = 1425000
x = 1425000
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