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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/9 = 344/x // - 344/x
4/9-(344/x) = 0
4/9-344*x^-1 = 0
-344*x^-1 = -4/9 // : -344
x^-1 = 1/774
-1 < 0
1/(x^1) = 1/774 // * x^1
1 = 1/774*x^1 // : 1/774
774 = x^1
x = 774
x = 774
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