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p in (-oo:+oo)
(31/4)*p = 21/2 // - 21/2
(31/4)*p-(21/2) = 0
(31/4)*p-21/2 = 0
31/4*p-21/2 = 0 // + 21/2
31/4*p = 21/2 // : 31/4
p = 21/2/31/4
p = 42/31
p = 42/31
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