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p in (-oo:+oo)
(2*p)/7+3/7 = 15/7 // - 15/7
(2*p)/7+3/7-(15/7) = 0
(2*p)/7+3/7-15/7 = 0
2/7*p-12/7 = 0 // + 12/7
2/7*p = 12/7 // : 2/7
p = 12/7/2/7
p = 6
p = 6
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