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m = 9p^2 + 42p + 49 -9p^2 + 42p - 49)
m = 9p^2 - 9p^2 + 42p + 42p + 49 - 49
m = 84p
= (9p+21p+21p+49)-(9p-21p-21p-49)
= (51p+49)-(33p-49)
= 18p