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P in (-oo:+oo)
3/8 = 7*P // - 7*P
3/8-(7*P) = 0
3/8-7*P = 0
3/8-7*P = 0 // - 3/8
-7*P = -3/8 // : -7
P = -3/8/(-7)
P = 3/56
P = 3/56
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