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p in (-oo:+oo)
(7/8)*p = 15/4 // - 15/4
(7/8)*p-(15/4) = 0
(7/8)*p-15/4 = 0
7/8*p-15/4 = 0 // + 15/4
7/8*p = 15/4 // : 7/8
p = 15/4/7/8
p = 30/7
p = 30/7
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