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p in (-oo:+oo)
28/19 = 4*p // - 4*p
28/19-(4*p) = 0
28/19-4*p = 0
28/19-4*p = 0 // - 28/19
-4*p = -28/19 // : -4
p = -28/19/(-4)
p = 7/19
p = 7/19
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