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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5 = 3/4-(5/x) // - 3/4-(5/x)
5/x-(3/4)+5 = 0
5/x-3/4+5 = 0
5*x^-1 = -17/4 // : 5
x^-1 = -17/20
-1 < 0
1/(x^1) = -17/20 // * x^1
1 = -17/20*x^1 // : -17/20
-20/17 = x^1
x = -20/17
x = -20/17
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