find solution of (p+2)(p+3)+(p+3)(p-4)=p(2p-5)
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p²+ 3p + 2p + 6 + p² - 4p + 3p - 12 = 2p² - 5p
2p² + 4p - 6 = 2p² - 5p
4p + 5p = 6
9p = 6
p = 6/9
p = 2/3
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