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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = 34/x-(3/2)+6/4 // - 34/x-(3/2)+6/4
y-(34/x)+3/2-(6/4) = 0
y-34*x^-1+3/2-3/2 = 0
-34*x^-1 = -y // : -34
x^-1 = y/34
-1 < 0
1/(x^1) = y/34 // * x^1
1 = x^1*(y/34) // : y/34
34*y^-1 = x^1
x = 34*y^-1
x = 34*y^-1
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