Problem: the sum of three consecutive even numbers is 63 . find the middle number of the three ?
Rationale: "middle no = 63 / 3 = 21 ans e"
annotated_formula: add(add(power(add(add(divide(subtract(subtract(63, const_10), const_2), const_4), const_2), const_2), const_2), power(add(add(add(divide(subtract(subtract(63, const_10), const_2), const_4), const_2), const_2), const_2), const_2)), add(power(divide(subtract(subtract(63, const_10), const_2), const_4), const_2), power(add(divide(subtract(subtract(63, const_10), const_2), const_4), const_2), const_2)))