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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.5 = 200000/x // - 200000/x
0.5-(200000/x) = 0
0.5-200000*x^-1 = 0
-200000*x^-1 = -0.5 // : -200000
x^-1 = 0.0000025
-1 < 0
1/(x^1) = 0.0000025 // * x^1
1 = 0.0000025*x^1 // : 0.0000025
400000 = x^1
x = 400000
x = 400000
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