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D( L )
L = 0
L = 0
L = 0
L in (-oo:0) U (0:+oo)
5/7 = 35/L // - 35/L
5/7-(35/L) = 0
5/7-35*L^-1 = 0
-35*L^-1 = -5/7 // : -35
L^-1 = 1/49
-1 < 0
1/(L^1) = 1/49 // * L^1
1 = 1/49*L^1 // : 1/49
49 = L^1
L = 49
L = 49
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