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p in (-oo:+oo)
(2*p)/7-(p/2) = -3 // + 3
(2*p)/7-(p/2)+3 = 0
3-3/14*p = 0 // - 3
-3/14*p = -3 // : -3/14
p = -3/(-3/14)
p = 14
p = 14
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