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p in (-oo:+oo)
-21 = p/5-16 // - p/5-16
16-(p/5)-21 = 0
-1/5*p-5 = 0 // + 5
-1/5*p = 5 // : -1/5
p = 5/(-1/5)
p = -25
p = -25
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