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2p
b. 3x²+ x²+ x = 4x² + x
xy xy
h. 18xy - 4xy - 2
9y²
= 14xy - 2
9y²
i. 6p² - 9p - 2q² + 8q
18pq
j. 16m + 12 - 5m2 - 12m
12mn