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D( l )
l = 0
l = 0
l = 0
l in (-oo:0) U (0:+oo)
2/5 = 10/l // - 10/l
2/5-(10/l) = 0
2/5-10*l^-1 = 0
-10*l^-1 = -2/5 // : -10
l^-1 = 1/25
-1 < 0
1/(l^1) = 1/25 // * l^1
1 = 1/25*l^1 // : 1/25
25 = l^1
l = 25
l = 25
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