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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
12/7 = 36/m // - 36/m
12/7-(36/m) = 0
12/7-36*m^-1 = 0
-36*m^-1 = -12/7 // : -36
m^-1 = 1/21
-1 < 0
1/(m^1) = 1/21 // * m^1
1 = 1/21*m^1 // : 1/21
21 = m^1
m = 21
m = 21
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