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7p - 9p + 2 - 5
-2p + (-3)
-2p - 3
b. x + 6y - 5y - 4x + 2xy - 6y
-3x + (-5y) + 2xy
-3 - 5y + 2xy
c. 7x2 - 4x - 5 - (-8)2 + 2x - 3
7x2 - (-2x) - 8 - 8pnkat2
7x2 + 2x -8 - 8pngkat2
b. (4x + 2xy - 6y) - (x + 6xy - 5y)
= 4x - x + 2xy - 6xy - 6y + 5y
= 3x - 4xy - y
c. (-8x² + 2x - 3) - (7x² - 4x - 5)
= -8x² - 7x² + 2x + 4x - 3 + 5
= -15x² + 6x + 2