See , Ex--> (i) R1 has value 5 ,and transfer(store) that value to some memory address(Loc = 3000)
Now, at some time, suppose a new program or same program only wants that value to load in some register say R2.
This time we didn't load it into R1, because data of R1 will be needed in future .Now, R1 = R2 = 5 = LOC (3000)
RHS is also doing the same thing.
(ii) LHS is saying load 5 in all , but RHS says, no need of LOC .
So, we are not sure about what LOC contains. IN this statement, there is no role of LOC. so, how can we say LOC contains 5 or any other garbage value.