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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
40.8/x = 0.97 // - 0.97
40.8/x-0.97 = 0
40.8*x^-1 = 0.97 // : 40.8
x^-1 = 0.02377451
-1 < 0
1/(x^1) = 0.02377451 // * x^1
1 = 0.02377451*x^1 // : 0.02377451
42.06185532 = x^1
x = 42.06185532
x = 42.06185532
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