7+2*9-4=77 7+2*9-4=17 9+18:3+6=11 9+18:3+6=15
(7 + 2) * 9 - 4 = 77 7 + 2 * (9 - 4) = 17 9 + 18 : (3 + 6) = 11 (9 + 18) : 3 + 6 = 15