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D( m )
1-(2*m) = 0
3*m-4 = 0
1-(2*m) = 0
1-(2*m) = 0
1-2*m = 0
1-2*m = 0 // - 1
-2*m = -1 // : -2
m = -1/(-2)
m = 1/2
3*m-4 = 0
3*m-4 = 0
3*m-4 = 0 // + 4
3*m = 4 // : 3
m = 4/3
m in (-oo:1/2) U (1/2:4/3) U (4/3:+oo)
5/(3*m-4) = -3/(1-(2*m)) // + -3/(1-(2*m))
5/(3*m-4)-(-3/(1-(2*m))) = 0
5/(3*m-4)+3*(1-2*m)^-1 = 0
5/(3*m-4)+3/(1-2*m) = 0
(5*(1-2*m))/((3*m-4)*(1-2*m))+(3*(3*m-4))/((3*m-4)*(1-2*m)) = 0
5*(1-2*m)+3*(3*m-4) = 0
-m-7 = 0
(-m-7)/((3*m-4)*(1-2*m)) = 0
(-m-7)/((3*m-4)*(1-2*m)) = 0 // * (3*m-4)*(1-2*m)
-m-7 = 0
-m-7 = 0 // + 7
-m = 7 // * -1
m = -7
m = -7
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