-86
1308
{1, 53 and 72 lots of -1} ie 1*53*-1*-1*-1 ... *-1
How about: 8*9 = 72 as one example
72, 108, 144, 180, 216, 252, 288, 324, 360!
78
24 and 3
-86
6 + 12 = 18 6 * 12 = 72
-73
1308
60
86
98
{1, 53 and 72 lots of -1} ie 1*53*-1*-1*-1 ... *-1
How about: 8*9 = 72 as one example
72 x 72 = 5,184