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p in (-oo:+oo)
(7*p)/9 = 3/4 // - 3/4
(7*p)/9-(3/4) = 0
(7*p)/9-3/4 = 0
7/9*p-3/4 = 0 // + 3/4
7/9*p = 3/4 // : 7/9
p = 3/4/7/9
p = 27/28
p = 27/28
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