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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
21/6 = 35/m // - 35/m
21/6-(35/m) = 0
21/6-35*m^-1 = 0
-35*m^-1 = -7/2 // : -35
m^-1 = 1/10
-1 < 0
1/(m^1) = 1/10 // * m^1
1 = 1/10*m^1 // : 1/10
10 = m^1
m = 10
m = 10
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