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p in (-oo:+oo)
7/3 = p/3 // - p/3
7/3-(p/3) = 0
7/3-1/3*p = 0 // - 7/3
-1/3*p = -7/3 // : -1/3
p = -7/3/(-1/3)
p = 7
p = 7
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