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
3/7+ 9/21 is equal to (3x3)/(7x3) + 9/21 which is equal to 9/21 + 9/21 , because both denominators are the same you can simply add the two numerators which then becomes 18/21 , then yo can cancel it down to 6/7
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
3/7 + 8/21 = 9/21 + 8/21 = 17/21
(21 + 7) x (9-4) - 16 (28) x (5) - 16 140 - 16 124