Unfortunately, the browser used for posting questions is hopelessly inadequate for mathematics: it strips away most symbols. We cannot see what operator comes before the last 7. It makes little sense for me to try and guess - I may as well make up my own questions and answer them!
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If you mean: 7p-3p+4-2 = 2p-1+10 => 4p+2 = 2p+9 => 2p = 7 Therefore: p = 7/2 => p = 3.5
4p + 9 - 7p + 2 4p - 7p + 9 + 2 p(4 - 7) + 9 + 2 -3p + 11
4p + 9 + (-7p) + 2 = 4p - 7p + 9 + 2 = -3p + 11
3p +12= 7p 7p-3p=12 12?3=4 p=4
4p+9-7p+2 -3p+11 p = 11/3