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p in (-oo:+oo)
2/28 = p/35 // - p/35
2/28-(p/35) = 0
1/14-1/35*p = 0 // - 1/14
-1/35*p = -1/14 // : -1/35
p = -1/14/(-1/35)
p = 5/2
p = 5/2
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