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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/15 = 48/x // - 48/x
6/15-(48/x) = 0
6/15-48*x^-1 = 0
-48*x^-1 = -2/5 // : -48
x^-1 = 1/120
-1 < 0
1/(x^1) = 1/120 // * x^1
1 = 1/120*x^1 // : 1/120
120 = x^1
x = 120
x = 120
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