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p in (-oo:+oo)
(-13/4)*p = 5/8 // - 5/8
(-13/4)*p-(5/8) = 0
(-13/4)*p-5/8 = 0
-13/4*p-5/8 = 0 // + 5/8
-13/4*p = 5/8 // : -13/4
p = 5/8/(-13/4)
p = -5/26
p = -5/26
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