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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
64/5.3 = 92/x // - 92/x
64/5.3-(92/x) = 0
64/5.3-92*x^-1 = 0
-92*x^-1 = -12.0754717 // : -92
x^-1 = 0.13125513
-1 < 0
1/(x^1) = 0.13125513 // * x^1
1 = 0.13125513*x^1 // : 0.13125513
7.61874983 = x^1
x = 7.61874983
x = 7.61874983
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