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p in (-oo:+oo)
(1/9)*p-9 = (4/9)*p-29 // - (4/9)*p-29
(1/9)*p-((4/9)*p)-9+29 = 0
(1/9)*p+(-4/9)*p-9+29 = 0
20-1/3*p = 0 // - 20
-1/3*p = -20 // : -1/3
p = -20/(-1/3)
p = 60
p = 60
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