\(=\dfrac{x+5}{2x}+\dfrac{x-6}{x-5}-\dfrac{3x^2-2x-9}{2x\left(x-5\right)}\)
\(=\dfrac{\left(x+5\right)\left(x-5\right)+2x\left(x-6\right)-3x^2+2x+9}{2x\left(x-5\right)}\)
\(=\dfrac{x^2-25+2x^2-12x-3x^2+2x+9}{2x\left(x-5\right)}\)
\(=\dfrac{-10x-16}{2x\left(x-5\right)}=\dfrac{-5x-8}{x\left(x-5\right)}\)