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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(41/3)/x = (31/4)/5 // - (31/4)/5
(41/3)/x-((31/4)/5) = 0
(41/3)/x-31/20 = 0
41/3*x^-1 = 31/20 // : 41/3
x^-1 = 93/820
-1 < 0
1/(x^1) = 93/820 // * x^1
1 = 93/820*x^1 // : 93/820
820/93 = x^1
x = 820/93
x = 820/93
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