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p in (-oo:+oo)
8/5 = (-7/9)*p // - (-7/9)*p
8/5-((-7/9)*p) = 0
(7/9)*p+8/5 = 0
7/9*p+8/5 = 0 // - 8/5
7/9*p = -8/5 // : 7/9
p = -8/5/7/9
p = -72/35
p = -72/35
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