It is a linear equation in one variable, p.
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p = 4
p=-15
20 = 4p + 5 +p 20 = 5p + 5 5p = 20 - 5 = 15 5p = 15 p = 15/5 = 3
p+3 ----- = 4... Therefore p=37 OR 10 p+3/10 = 4... therefore p=3.7
p2 = 2p + 15 p2 - 2p - 15 = 0 (p - 5)*(p + 3) = 0 so p - 5 = 0 or p + 3 = 0 so p = 5 or p = -3