
,

,

,

,

;; to find the answer, set the expressions equal to each other, since the sum of the numbers should be the same.
Use

and solve for

, which would result in

.
You can also use

to find

– or

.
Plug in the values for

and

, and find

using

or

and results in

.
After plugging in the

value, you can easily find

and

.

– since 66 is the sum of a full row, and the sums of the numbers in each row, column, and diagonal are the same, so therefore,

should also equal 66. This results in

, and, using the same value for the sum of

, or

, we find that

.
The final answer is

,

,

,

,

.
Sorry it took so long;; I hope this helps :)