a number is doubled and 9 is added . if the resultant is trebled , it becomes 69 . what is that number ?
"let the number be x . then , 3 ( 2 x + 9 ) = 69 2 x = 14 = > x = 7 answer : d"
divide(subtract(69, multiply(const_3, 9)), multiply(const_3, const_2))