Not by a whole number, but 7 * (78/7) will give you 78 since the 7's will cancel out.
17 and 7
about 7.142857143
94.857142857142857142857142857143
3/7
The number is 5/7.
1 x 28, 2 x 14, 4 x 7
7(a+3)
7, -7
The number 7 is a factor of 7,14,21,28,35,42,49,56,63,70,77,84,91,98,105 or anything multiplied by 7.
It is: 7
7