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2) 5y-10y+13y=8y
3)17a2+3a+11a2=28a2+3a
4) 6pq+5p2-8pq-p2+pq= -pq +4p2
5) 8 (a+2b) - 12 (2a-b) =
8a + 16b - 24a+12b
8a-24a+16b+12b
-16a+28b