Ken's Puzzle of the Week

Sums with 1 to 9

1   2   4

Place all of the digits 1-9 into the white boxes and one of the symbols (+ or -) into each of the gray boxes such that:
  1. Each of the six rows and columns have the same sum (other than 15).  There's definitely a solution with a common sum of 5.  Are there others?
  2. The sum of each row or column is equal to the noted number in its first square. For example, the third column will have a sum of 4, and the first row and column will both have a sum of 1.

Source: Original. [Thanks to Mark Rickert for updating part 2 to a solvable problem.]

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