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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.3/1.58 = 49.75/x // - 49.75/x
3.3/1.58-(49.75/x) = 0
3.3/1.58-49.75*x^-1 = 0
-49.75*x^-1 = -2.08860759 // : -49.75
x^-1 = 0.04198206
-1 < 0
1/(x^1) = 0.04198206 // * x^1
1 = 0.04198206*x^1 // : 0.04198206
23.81969822 = x^1
x = 23.81969822
x = 23.81969822
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