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p in (-oo:+oo)
(1/4)*p = 1/8 // - 1/8
(1/4)*p-(1/8) = 0
(1/4)*p-1/8 = 0
1/4*p-1/8 = 0 // + 1/8
1/4*p = 1/8 // : 1/4
p = 1/8/1/4
p = 1/2
p = 1/2
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