Given the following data:
P4O10(s) → P4(s) + 5O2(g) ΔH = 2940.1 kJ
P4O6(s) + 2O2(g) → P4O10(s) ΔH = -1300 kJ

Find the ΔH of the following reaction:
P4O6(s) → P4(s) + 3O2(g)