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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
12-(3/m) = 18 // - 18
12-(3/m)-18 = 0
12-3*m^-1-18 = 0
-3*m^-1 = 6 // : -3
m^-1 = -2
-1 < 0
1/(m^1) = -2 // * m^1
1 = -2*m^1 // : -2
-1/2 = m^1
m = -1/2
m = -1/2
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