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D( l )
l = 0
l = 0
l = 0
l in (-oo:0) U (0:+oo)
3/l = 4/1 // - 4/1
3/l-(4/1) = 0
3/l-4 = 0
3*l^-1 = 4 // : 3
l^-1 = 4/3
-1 < 0
1/(l^1) = 4/3 // * l^1
1 = 4/3*l^1 // : 4/3
3/4 = l^1
l = 3/4
l = 3/4
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