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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7.416 = 120/x // - 120/x
7.416-(120/x) = 0
7.416-120*x^-1 = 0
-120*x^-1 = -7.416 // : -120
x^-1 = 0.0618
-1 < 0
1/(x^1) = 0.0618 // * x^1
1 = 0.0618*x^1 // : 0.0618
16.18122977 = x^1
x = 16.18122977
x = 16.18122977
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