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b. -3x -4y -4p
;)
=15x + 7y - 5r - (6x - 2y + 7r)
=15x + 7y - 5r - 6x + 2y - 7r
=9x + 9y -12r
b.
=7x + y + 6p - (4x -3y + 2p)
=7x + y + 6p -4x + 3y - 2p
=3x + 4y + 4p