Hi guys, need help on this question

My working:

(6)/(x^2-3x) - (5)/(2)(3-x) = (6)/(x)(x-3) - (5)/(2)(3-x)

= - (6)/(x)(3-x) - (5)/(2)(3-x)

= -6(-2)-5(-x)/2x(3-x)

= (12+5x)/(2x)(3-x)

Answer = (5x+12)/(2x)(x-3)

What is wrong with my working?

P.S sorry that it's a bit messy, I don't know how to make it into that "mathematics" form.