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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
360000 = 200/x // - 200/x
360000-(200/x) = 0
360000-200*x^-1 = 0
-200*x^-1 = -360000 // : -200
x^-1 = 1800
-1 < 0
1/(x^1) = 1800 // * x^1
1 = 1800*x^1 // : 1800
1/1800 = x^1
x = 1/1800
x = 1/1800
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