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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(16.75/x) = 0.3 // - 0.3
1-(16.75/x)-0.3 = 0
1-16.75*x^-1-0.3 = 0
-16.75*x^-1 = -0.7 // : -16.75
x^-1 = 0.04179104
-1 < 0
1/(x^1) = 0.04179104 // * x^1
1 = 0.04179104*x^1 // : 0.04179104
23.92857416 = x^1
x = 23.92857416
x = 23.92857416
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