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D( m )
3*m-1 = 0
1-(3*m) = 0
3*m-1 = 0
3*m-1 = 0
3*m-1 = 0 // + 1
3*m = 1 // : 3
m = 1/3
1-(3*m) = 0
1-(3*m) = 0
1-3*m = 0
1-3*m = 0 // - 1
-3*m = -1 // : -3
m = -1/(-3)
m = 1/3
m in (-oo:1/3) U (1/3:+oo)
5/(3*m-1)-(2/(1-(3*m))) = 0
5/(3*m-1)-2*(1-3*m)^-1 = 0
5/(3*m-1)-2/(1-3*m) = 0
(5*(1-3*m))/((3*m-1)*(1-3*m))+(-2*(3*m-1))/((3*m-1)*(1-3*m)) = 0
5*(1-3*m)-2*(3*m-1) = 0
7-21*m = 0
(7-21*m)/((3*m-1)*(1-3*m)) = 0
(7-21*m)/((3*m-1)*(1-3*m)) = 0 // * (3*m-1)*(1-3*m)
7-21*m = 0
7-21*m = 0 // - 7
-21*m = -7 // : -21
m = -7/(-21)
m = 1/3
m in { 1/3}
m belongs to the empty set
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