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D( l )
l = 0
l = 0
l = 0
l in (-oo:0) U (0:+oo)
7.63 = 199.886/l // - 199.886/l
7.63-(199.886/l) = 0
7.63-199.886*l^-1 = 0
-199.886*l^-1 = -7.63 // : -199.886
l^-1 = 0.03817176
-1 < 0
1/(l^1) = 0.03817176 // * l^1
1 = 0.03817176*l^1 // : 0.03817176
26.19737733 = l^1
l = 26.19737733
l = 26.19737733
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