find the common denominator:
(5-x)((xplus 9)/(x-5)) + (5-x)((2x)/(5-x))
=5xplus45-x^2-9xplus10x-2x^2
simplify that to :(-3x^2 + 6x +45)/((5-x)(x-5)
and you can even factor out the -3 from the top
if you wanna make it look extra sexy haha jk
check my math though yeh?