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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-((-8*x-3)/x)-(9/x)-4-4 = 0
x-((-8*x-3)/x)-9*x^-1-4-4 = 0
(-1*(-8*x-3))/x+x-9/x-4-4 = 0
(-1*(-8*x-3))/x+(x^2)/x-9/x+(-4*x)/x+(-4*x)/x = 0
x^2-1*(-8*x-3)-4*x-4*x-9 = 0
x^2+8*x-4*x-4*x-9+3 = 0
x^2+8*x-4*x-4*x-6 = 0
x^2+4*x-4*x-6 = 0
x^2-6 = 0
(x^2-6)/x = 0
(x^2-6)/x = 0 // * x
x^2-6 = 0
1*x^2 = 6 // : 1
x^2 = 6
x^2 = 6 // ^ 1/2
abs(x) = 6^(1/2)
x = 6^(1/2) or x = -6^(1/2)
x in { 6^(1/2), -6^(1/2) }
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