Question 1019492
You will need your algebra factorization knowledge(skills) and your already-learned fraction skills.


{{{((a^2-36)/(x^2-y^2))/((a+6)/(y-x))}}}


{{{((a^2-36)/(y-x))((x^2-y^2)/(a+6))}}}, this could have been done in two or three more steps, but the "invert and multiply" is easier.


{{{((a^2-36)(x^2-y^2))/((y-x)(a+6))}}}
NOW is when you factorize and simplify....
You take care of the rest.