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D( x )
9*x = 0
4*x = 0
9*x = 0
9*x = 0
9*x = 0 // : 9
x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
1/(9*x)-(1/(4*x)) = 0
1/(9*x)+(-1/4)*x^-1 = 0
-5/36*x^-1 = 0 // : -5/36
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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