Question 281433
(-a+b/3ab) / (a-b/2ab)

Invert and multiply:

((-a+b)/3ab))*(2ab/(a-b))=
((-a+b)*2ab))/(3ab*(a-b))=
(-(a-b)/(a-b))*(2ab/3ab) =
-1*2/3 = -2/3