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p in (-oo:+oo)
(3/5)*p < -12 // + 12
(3/5)*p+12 < 0
3/5*p+12 < 0 // - 12
3/5*p < -12 // : 3/5
p < -12/3/5
p < -20
p in (-oo:-20)
(-oo:-20)
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