Answer:
Matt has 5d - 8 stickers now.
Step-by-step explanation:
For this problem, David has d stickers and Matt has m stickers. We know Matt has 5 times as many stickers as David so m = 5d.
David = d
Matt = 5d
If Matt gives David 8 slides, now Matt has 5d - 8 stickers.
So, after giving David 8 stickers, Matt has 5d-8 stickers.