Partially Magic Squares

Place the numbers 19 into
a 3x3 grid, such that the four sides and the two diagonals each
have the same sum
(greater than 15.)
What is the number in the center of the grid?

Disregarding rotations and reflections, find all partially magic squares
which use the numbers 19 and in which at least six lines of
three numbers have the same sum (other than 15).
Source: Original.
Solution
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