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p in (-oo:+oo)
(-91*p)/4 = 5 // - 5
(-91*p)/4-5 = 0
-91/4*p-5 = 0 // + 5
-91/4*p = 5 // : -91/4
p = 5/(-91/4)
p = -20/91
p = -20/91
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