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p in (-oo:+oo)
1/4-p > 3/4 // - 3/4
1/4-p-(3/4) > 0
1/4-p-3/4 > 0
-p-1/2 > 0
-p > 1/2 // * -1
p < -1/2
p in (-oo:-1/2)
(-oo:-1/2)
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