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4p + 9 + (-7p) + 2 = 4p - 7p + 9 + 2 = -3p + 11
8p+5 = 11+7p= 8p-7p = 11-5p = 6
6nx + 7p - 14p + 2nx + 6x = 8nx - 7p + 6x
7+5q = -3 5q = -3-7 5q =-10 q = -2
7p+5q=-3, p=1 7Xp+5q=-3 7+5q=-3 5p=-10 p=-2