7
x : 7 or 1 : 7/x or x/7 : 1
784
2744 = 1 x 1 x 2 x 2 x 2 x 7 x 7 x 7 Make 3 groups of these factors and multiply the numbers in each group to get 3 numbers, eg: {1}, {1}, {2, 2, 2, 7, 7, 7} = 1 x 1 x 2744 {1}, {1, 2}, {2, 2, 7, 7, 7} = 1 x 2 x 1372 {1, 2}, {1, 2, 7}, {2, 7, 7} = 2 x 14 x 98 {1, 2, 7}, {1, 2, 7}, {2, 7} = 14 x 14 x 14 There are many more such answers.
1029
7a3 = 7 x a x a x a.
Yes, -7 = -1 x 7 (or 1 x -7)
1 x 7, 7 x 1
49 x 1/7 = 7
1 x 7 = 7 7 x 1 = 7
(x - 7)(x - 1) or (x + 7)(x + 1) depending on sign of 8x so zero is +/- 7 and +/- 1
1 x 7, 7 x 1 = 7
1 x 7, 7 x 1