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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(9*x)/x+1 = 1-(9/x)+4 // - 1-(9/x)+4
9/x+(9*x)/x-4-1+1 = 0
9*x^-1 = -5 // : 9
x^-1 = -5/9
-1 < 0
1/(x^1) = -5/9 // * x^1
1 = -5/9*x^1 // : -5/9
-9/5 = x^1
x = -9/5
x = -9/5
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