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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.18 = 40/x // - 40/x
1.18-(40/x) = 0
1.18-40*x^-1 = 0
-40*x^-1 = -1.18 // : -40
x^-1 = 0.0295
-1 < 0
1/(x^1) = 0.0295 // * x^1
1 = 0.0295*x^1 // : 0.0295
33.89830508 = x^1
x = 33.89830508
x = 33.89830508
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