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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(9/x)+4 = x-(2/X)+3 // - x-(2/X)+3
2/X+x-x-(9/x)-3+4 = 0
2/X+x-x-9*x^-1-3+4 = 0
-9*x^-1 = -(2*X^-1+1) // : -9
x^-1 = (2*X^-1+1)/9
-1 < 0
1/(x^1) = (2*X^-1+1)/9 // * x^1
1 = x^1*((2*X^-1+1)/9) // : (2*X^-1+1)/9
9*(2*X^-1+1)^-1 = x^1
x = 9*(2*X^-1+1)^-1
x = 9*(2*X^-1+1)^-1
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