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D( l )
l = 0
l = 0
l = 0
l in (-oo:0) U (0:+oo)
27/l = 2106 // - 2106
27/l-2106 = 0
27*l^-1 = 2106 // : 27
l^-1 = 78
-1 < 0
1/(l^1) = 78 // * l^1
1 = 78*l^1 // : 78
1/78 = l^1
l = 1/78
l = 1/78
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