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D( L )
L = 0
L = 0
L = 0
L in (-oo:0) U (0:+oo)
2/15 = 4/L // - 4/L
2/15-(4/L) = 0
2/15-4*L^-1 = 0
-4*L^-1 = -2/15 // : -4
L^-1 = 1/30
-1 < 0
1/(L^1) = 1/30 // * L^1
1 = 1/30*L^1 // : 1/30
30 = L^1
L = 30
L = 30
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