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p in (-oo:+oo)
(1/3)*(2-(5*p)) = -13 // + 13
(1/3)*(2-(5*p))+13 = 0
(1/3)*(2-5*p)+13 = 0
1/3*(2-5*p)+13 = 0
1/3*(2-5*p)+13 = 0
41/3-5/3*p = 0
41/3-5/3*p = 0
41/3-5/3*p = 0 // - 41/3
-5/3*p = -41/3 // : -5/3
p = -41/3/(-5/3)
p = 41/5
p = 41/5
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