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p in (-oo:+oo)
-((1/8)*p)-16 = (3/8)*p // - (3/8)*p
-((1/8)*p)-((3/8)*p)-16 = 0
(-1/8)*p+(-3/8)*p-16 = 0
-1/2*p-16 = 0 // + 16
-1/2*p = 16 // : -1/2
p = 16/(-1/2)
p = -32
p = -32
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