Brain Game: Number Block Puzzle #3

Here's the third entry in our Brain Game number block puzzle series. Enjoy!

Each of the nine squares inside the main red grid should contain either a 4, 5, or 6. Four of these numbers (all of them 6s) are already provided for you. Place a 4, 5, or 6 in each of the blank squares so that the sum of the rows, columns, and diagonals equal the totals shown at the ends of those lines (after the equals signs).

NOTE: Mike the math whiz has again revealed at least one other correct solution for this Number Block, so as long as your solution works, that's all that matters. Good luck:

Here is ONE SOLUTION.

ONE POSSIBLE SOLUTION (there's at least one other):