On the equation (1-x) / (x-3) + (1-mx) / (3-x) = 1 of X, there is no solution, find the value of M

On the equation (1-x) / (x-3) + (1-mx) / (3-x) = 1 of X, there is no solution, find the value of M

Change the formula to: (m-1) xsquare + (3-3m) X-1 = 0
Then the discriminant is less than zero
Turn out: 5 / 9