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= 30p2 - 12p2 + 10p - 4p
= 18p2 + 6p
b. 5x+7y-3x-4y
= 5x -3x +7y -4y
= 2x + 3y
c. 5(3x-1)-12x+y
= 15x - 5 -12x + y
= 15x -12x - 5 +y
= 3x - 5 + y