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2. (6p-5q-2r) + (-8p+6q+9r) = -2p+q+7r
3. a. (2x²+15x-18) - (11x²-17x+24) = -9x^2-2x+6
b. -5(4y²-2y+8) - 4(7y²+6y-5) = -20y^2+10y-40 - 28y^2-24y+20 = -48y^2-14y-20