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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
4/8 = 18/m // - 18/m
4/8-(18/m) = 0
4/8-18*m^-1 = 0
-18*m^-1 = -1/2 // : -18
m^-1 = 1/36
-1 < 0
1/(m^1) = 1/36 // * m^1
1 = 1/36*m^1 // : 1/36
36 = m^1
m = 36
m = 36
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