'A + B' means 'A is the mother of B','A ÷ B' means 'A is the husband of B','A & B' means 'A is the wife of B','A × B' means 'A is the sister of B','A - B' means 'A is the son of B'.If 'H - D + C × B ÷ A + X', then how is D related to X?

Let's break down the given expression 'H - D + C × B ÷ A + X' from left to right:H - D: H is the son of D.D + C: D is the mother of C (so D is female).C × B: C is the sister of B (C and B are siblings, both children of D).B ÷ A: B is the husband of A (B is male, A is his wife). Since B is D's child, B is D's son.A + X: A is the mother of X.From this, we find the family structure for X:X's mother is A.A's husband is B (so B is X's father).B's mother is D.Therefore, D is the father's mother (paternal grandmother) of X.