from the Sum of 7p²+10p-28 and 8p²-2p+3 then subtract 3p²+2p+9
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Sum of 6m + 5n - 7p² and 6p² - 2m + n
= 4m + 6n - p^{2}p
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Sum of 2m + 3n - 10p² and -m - 2n - 3p²
= m + n - 13p^{2}p
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Subtraction of: m + n - 13p^{2}p
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from 4m + 6n - p^{2}p
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= 5m + 7n - 14p^{2}p
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