Problem: if a ( a - 8 ) = 9 and b ( b - 8 ) = 9 , where a ≠ b , then a + b =
Rationale: "i . e . if a = - 1 then b = 9 or if a = 9 then b = - 1 but in each case a + b = - 1 + 9 = 8 answer : option c"
annotated_formula: subtract(subtract(subtract(subtract(add(add(8, 9), subtract(8, 9)), const_1), const_1), const_1), const_1)