84
1
12 - (3^2 - 7) * 4 = 12 - (9 - 7) * 4 = 12 - 2 * 4 = 12 - 8 = 4
88. 12*7=84+4=88
4 and 7/12
12: 1 2 3 4 6 7 12 14 21 28 42 84.
4 with 7 remaining 55 - 7 = 48 = 12 x 4
672
168
LCM(4, 5, 7) = 140
It is: 252
7 20/4: = 7 + 20/4 = 7 + 5 = 12 (this is a whole number)