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p in (-oo:+oo)
(5*p)/3 = 5*p-90 // - 5*p-90
(5*p)/3-(5*p)+90 = 0
(5*p)/3-5*p+90 = 0
90-10/3*p = 0 // - 90
-10/3*p = -90 // : -10/3
p = -90/(-10/3)
p = 27
p = 27
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