1. ~(J * L)
2. (J --> ~L) --> (~M * ~X)
3. E v (M v X). .·. E
4. ~J v ~L 1, DeMorgan's law
5. J --> ~L 4, Material Implication
6. ~M * ~X 2,5, Modus Ponens
7. ~(M v X) 6, DeMorgan's law
8. (M v X) v E 3, Commutation
9. E 8,7 Disjunctive Syllogism
Edwin