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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
(m-12)/m = 5 // - 5
(m-12)/m-5 = 0
(m-12)/m+(-5*m)/m = 0
m-5*m-12 = 0
-4*m-12 = 0
(-4*m-12)/m = 0
(-4*m-12)/m = 0 // * m
-4*m-12 = 0
-4*m-12 = 0 // + 12
-4*m = 12 // : -4
m = 12/(-4)
m = -3
m = -3
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