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p in (-oo:+oo)
(1/2)*p-15 = (3/4)*p-3 // - (3/4)*p-3
(1/2)*p-((3/4)*p)-15+3 = 0
(1/2)*p+(-3/4)*p-15+3 = 0
-1/4*p-12 = 0 // + 12
-1/4*p = 12 // : -1/4
p = 12/(-1/4)
p = -48
p = -48
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