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p in (-oo:+oo)
-10 = (5/9)*p // - (5/9)*p
-((5/9)*p)-10 = 0
(-5/9)*p-10 = 0
-5/9*p-10 = 0 // + 10
-5/9*p = 10 // : -5/9
p = 10/(-5/9)
p = -18
p = -18
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