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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^2-((4*x)/x)-2 = 14-((9*x)/x)-2 // - 14-((9*x)/x)-2
x^2-((4*x)/x)+(9*x)/x-14-2+2 = 0
x^2+(9*x)/x-14-4-2+2 = 0
1*x^2 = 9 // : 1
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
x in { 3, -3 }
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