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