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-36x + 7 y
b. 70a(pangkat 3) -20a(pangkat 2) -10a(pangkat 2) +84a(pangkat 2) -24a -12a
=70a(pangkat 3) +54a(pangkat 2) -36a
= -24x - 6y - 12x + 13y
= -24x - 12x - 6y + 13y
= -36x + 7y
b. 14a^2 - 4a - 2a (5a + 6)
= 14a^2 - 4a - 10a^2 - 12a
= 14a^2 - 10a^2 - 4a - 12a
= 4a^2 - 16a
#Maaf kalo salah...