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5(4a-b)-9(b-2a)+7(3a-7b)= 20a -5b -9b +18a +21a - 49b =59a -63b
2a(x+5y)+3x(a-5y)=2ax + 10 ay +3ax - 15xy = 5ax +10 ay -15xy
-4b(2a-8y)+3y(b-7a)=-8ab +32by +3by - 21ay = 8ab + 35by - 21ay
b) 20a - 5b - 9b + 18a + 21a - 49b = 20a + 18a + 21a - 5b - 9b - 49b =
= 59a - 63b
c)2ax + 10ay + 3ax - 15ay = 5ax - 5ay
d) -8ay + 32by + 3by - 21ay = -29ay + 35 by