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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
30/x = 450 // - 450
30/x-450 = 0
30*x^-1 = 450 // : 30
x^-1 = 15
-1 < 0
1/(x^1) = 15 // * x^1
1 = 15*x^1 // : 15
1/15 = x^1
x = 1/15
x = 1/15
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