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=4p+8p-11q-10q-9r+9r
=12p-21q
2.) {4(7y²+6y-5)} - {-5(4y²-2y+8)}
={28y²+24y-20}-{-20y²+20y-40}
=28y²+20y²+24y-20y-20+40
=48y²4y+20
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