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