21 + 9 + 7 = 37
Are you trying to say 17 + 6 + (7-9) ? = 21
21
21
21
3/7=9/21 1/3=7/21 9+7=16/21
90
5/1 + 7 + 9 = 5 + 7 + 9 = 21
3 over 7 because nothing can get to 2 when your dividing by 9 plus 9/3=3 and 21/3=7 ( / = division)
9+7+5+3+1 16+5+3+1 21+3+1 24+1 25
(21 + 7) x (9-4) - 16 (28) x (5) - 16 140 - 16 124
3/7 + 8/21 = 9/21 + 8/21 = 17/21
14/21 + 9/21 = 23/21