m/x+3 - n/x-3 =8x/(x∧2-9)
[m(x-3)-n(x+3)]/(x^2-9)=8x/(x^2-9)
[(m-n)x-(3m+3n)]/(x^2-9)=8x/(x^2-9)
m-n=8
3m+3n=0
m=4
n=-4