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p in (-oo:+oo)
-3 < p/4 // - p/4
-(p/4)-3 < 0
-1/4*p-3 < 0 // + 3
-1/4*p < 3 // : -1/4
p > 3/(-1/4)
p > -12
p in (-12:+oo)
(-12:+oo)
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