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p in (-oo:+oo)
(4*p)/10-((4*p)/4) = 12 // - 12
(4*p)/10-((4*p)/4)-12 = 0
(4*p)/10-p-12 = 0
-3/5*p-12 = 0 // + 12
-3/5*p = 12 // : -3/5
p = 12/(-3/5)
p = -20
p = -20
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