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D( l )
l = 0
l = 0
l = 0
l in (-oo:0) U (0:+oo)
35/7 = 25/l // - 25/l
35/7-(25/l) = 0
35/7-25*l^-1 = 0
-25*l^-1 = -5 // : -25
l^-1 = 1/5
-1 < 0
1/(l^1) = 1/5 // * l^1
1 = 1/5*l^1 // : 1/5
5 = l^1
l = 5
l = 5
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