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p in (-oo:+oo)
1/4 = 4*p // - 4*p
1/4-(4*p) = 0
1/4-4*p = 0
1/4-4*p = 0 // - 1/4
-4*p = -1/4 // : -4
p = -1/4/(-4)
p = 1/16
p = 1/16
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