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p in (-oo:+oo)
8/10-2*p = 4 // - 4
8/10-2*p-4 = 0
-2*p-16/5 = 0 // + 16/5
-2*p = 16/5 // : -2
p = 16/5/(-2)
p = -8/5
p = -8/5
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