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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
60/8 = 420.75/x // - 420.75/x
60/8-(420.75/x) = 0
60/8-420.75*x^-1 = 0
-420.75*x^-1 = -15/2 // : -420.75
x^-1 = 0.01782531
-1 < 0
1/(x^1) = 0.01782531 // * x^1
1 = 0.01782531*x^1 // : 0.01782531
56.10000611 = x^1
x = 56.10000611
x = 56.10000611
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