I can see you are trying to create a chain of reactions based on the initial reactants Li2O and H3PO4. However, the second and third reactions you have written do not balance out properly.

We can fix the chain by balancing each equation:

Li2O + H3PO4 -> 2LiPO4 + H2O2LiPO4 + MgO -> Mg(PO4)2 + 2LiOHMg(PO4)2 + Al2O3 -> AlPO4 + MgO

This is a more accurate representation of a chain of reactions starting with Li2O and H3PO4.