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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x = 240 // - 240
15/x-240 = 0
15*x^-1 = 240 // : 15
x^-1 = 16
-1 < 0
1/(x^1) = 16 // * x^1
1 = 16*x^1 // : 16
1/16 = x^1
x = 1/16
x = 1/16
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