Bethany knits hats and scarves. A hat takes her 1.5 days, and a scarf takes her 4 days. Bethany recently spent 18 days knitting 7 items. Write and solve the system of equations to find the number of hats (h) and the number of scarves (s) that Bethany knitted.
3hats, 4 scarves
2hats, 5 scarves
4 hats, 3 scarves
5 hats, 2 scarves
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