if 3 < x < 6 < y < 7 , then what is the greatest possible positive integer difference of x and y ?
"3 < x < 6 < y < 7 ; 3 < x y < 7 3 + y < x + 7 y - x < 4 . positive integer difference is 3 ( for example y = 6.5 and x = 3.5 ) answer : a ."
subtract(subtract(7, 3), const_1)