7
5*(-8)+7*(9) = 23
7 + 16 = 23
23/8 There are 16 eighths in 2 (2 x 8) plus 7 = 23
2/7 + 1/8 = 23/56
89 + (23 x 56/7) = 89 + (23 x 8) = 273
8/5 + 7/10 = 16/10 + 7/10 = 23/10 = 23/10
7/8 + 1/12 = 23/24=7/8 +1/12= 21/24 + 2/24= 23/24
169
7/12 + 3/8 = 92/96 = 23/24
1 plus 2 plus 3 plus 4 plus 5 plus 6 plus 7 plus 8 times 9=100
23 + 8 = 31