25w - 8x + 4z - 6w + 13x - z
Make three piles. Put all the 'w's in the first pile, all the 'x's in the middle pile,
and all the 'z's in the third pile.
All the 'w's:
25w - 6w = 19w
All the 'x's:
-8x + 13x = 5x
All the 'z's:
4z - z = 3z
Now gather up all the piles and put them back together in one polynomial:
19w + 5x + 3z.
Technically, this process is called "combining like terms".
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