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-3p² - 10p² + 15p - 5p - 6 - 55 =
-13p² + 10p -61
= 5(2p²+p+11) - {-3(p²-5p+2)}
= 10p²+5p+55 - (-3p²+15p-6)
= 10p²+5p+55 + 3p² - 15p +6
= 10p² + 3p² + 5p - 15p + 55 + 6
= 13p² - 10p + 61