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2.-30-15y
3.-14a-49
4.-27p+45
5.-30-40d
6.-40r+24
7.-7(y+3)
8.-4(3-k)
9.-6(3-2h)
10.-5(4w+3)
11.-2(7-4x)
12.-3(8p-5)
13.- no
14.-si
15.-no
16.-no