If p * q = 2p + pq + q, find p when ( p * 2) - (p * 1) = 40
p * q = 2p + pq + q
(p*2) - (p*1) = 40
firstly, p = p and q = 2, secondly p = p and q = 1
then, 2p + 2p + 2 - (2p + p + 1) = 40
4p + 2 - 3p - 1 = 40
p + 1 = 40
p = 40 - 1 = 39
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