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p in (-oo:+oo)
(21/2)*p = 11/5 // - 11/5
(21/2)*p-(11/5) = 0
(21/2)*p-11/5 = 0
21/2*p-11/5 = 0 // + 11/5
21/2*p = 11/5 // : 21/2
p = 11/5/21/2
p = 22/105
p = 22/105
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