Answer:
-1/m^3
Step-by-step explanation:
m-3n/6m^3n - m+3n/6mn^3
=(m-3n)-(m+3n)/6m^3n [6m^3n is the L.C.M]
=m-3n-m-3n/6m^3n
=-6n/6m^3n
= -1/m^3
(Ans)
