**-9, 9, -6, 6, -3, 3, 12, 15, x **
Assign an integer to replace x so that the nine integers above can be arranged as a 3*3 magic square.

Rem: For conformity place the number "12" in the left corner of the top row. There are 2 complying squares .

Show both.

Resequence the numbers as

-9, -6, -3, 3, 6, 9, 12, 15.

If x = 0, we have 9 consecutive multiples of 3, which can obviously be made into a 3x3 magic square.

The requested squares are

12 -3 0

-9 3 15

6 9 -6

and its reflection,

12 -9 6

-3 3 9

0 15 -6

*Edited on ***April 3, 2018, 1:35 pm**