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p in (-oo:+oo)
(1/2)*(p-0.25) = 0.25 // - 0.25
(1/2)*(p-0.25)-0.25 = 0
1/2*(p-0.25)-0.25 = 0
1/2*(p-0.25)-0.25 = 0
1/2*p-0.375 = 0
1/2*p-0.375 = 0
1/2*p-0.375 = 0 // + 0.375
1/2*p = 0.375 // : 1/2
p = 0.375/1/2
p = 0.75
p = 0.75
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