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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
300/2.92 = 5280/x // - 5280/x
300/2.92-(5280/x) = 0
300/2.92-5280*x^-1 = 0
-5280*x^-1 = -102.73972603 // : -5280
x^-1 = 0.01945828
-1 < 0
1/(x^1) = 0.01945828 // * x^1
1 = 0.01945828*x^1 // : 0.01945828
51.39200382 = x^1
x = 51.39200382
x = 51.39200382
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