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a-21a= -20a
B)18a+20a+4a+15a+27a+28a= 112a
(6a + 4a - 9a) - (12a + 14a - 5a)
1a - 21a = - 20a
B- (6a3 + 4a5 + 2a2) + (5a3 + 3a9 + 4a7)
(18a + 20a + 4a) + (15a + 27a + 28a)
42a + 70a = 112a