-7p + 5r - 6p + 3r
= -7p - 6p + 5r + 3r
= -(7 + 6)p + (5 + 3)r
= -13p + 8r
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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
7p + 2 = 5p + 8 7p - 5p = 8 - 2 2p = 6 p = 3
14 + 6p = 6 + 7p 8 = p