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= 10p - 3 +2p
= 12p - 3
b) -x² + 5xy + 4x² - 4xy
= 3x² + xy
c) 3p³ - 5p² + 9p - (-2p³ + 4p² - 6p)
= 3p³ - 5p² + 9p +2p³ - 4p² + 6p
= 5p³ -9p² + 15p