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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 1000000 // - 1000000
5/x-1000000 = 0
5*x^-1 = 1000000 // : 5
x^-1 = 200000
-1 < 0
1/(x^1) = 200000 // * x^1
1 = 200000*x^1 // : 200000
1/200000 = x^1
x = 1/200000
x = 1/200000
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