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p in (-oo:+oo)
(5/7)*p = 10/21 // - 10/21
(5/7)*p-(10/21) = 0
(5/7)*p-10/21 = 0
5/7*p-10/21 = 0 // + 10/21
5/7*p = 10/21 // : 5/7
p = 10/21/5/7
p = 2/3
p = 2/3
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