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b. 9a2 - 3ab + 6 ab + 4a - 18 a = 9a2 + 3 ab - 14 a
c. 5x2 + 6xy - 2xy - 8y2 + 9y2 = 5x2 + 4xy + y2
d. 8p2q2 - p2q + 3p2q + 12 pq + 5 pq = 8 p2q2 + 2 p2q + 17 pq
e. 5y2 + 4y2 - y2 - 3 y + y + x2 - 1 = 8 y2 - 2y + x2 - 1