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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x+9)/x = 4*x+1 // - 4*x+1
(x+9)/x-(4*x)-1 = 0
(x+9)/x-4*x-1 = 0
(x+9)/x+(-4*x*x)/x+(-1*x)/x = 0
x-4*x*x-1*x+9 = 0
x-4*x^2-x+9 = 0
9-4*x^2 = 0
(9-4*x^2)/x = 0
(9-4*x^2)/x = 0 // * x
9-4*x^2 = 0
-4*x^2 = -9 // : -4
x^2 = 9/4
x^2 = 9/4 // ^ 1/2
abs(x) = 3/2
x = 3/2 or x = -3/2
x in { 3/2, -3/2 }
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