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= 10r^4 - 4r³ + 2r + 3p - 8p - 10p + pr
= 10r^4 - 4r³ + 2r - 15p + pr
3. (19y³ - 7y² + 6) + (2y³ + 6y² + y + 5) = 19y³ - 7y² + 6 + 2y³ + 6y² + y + 5
= 19y³ + 2y³ - 7y² + 6y² + 6 + 5
= 21y³ - y² + 11
3)