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p in (-oo:+oo)
(-5/13)*p = -4 // + 4
(-5/13)*p+4 = 0
4-5/13*p = 0 // - 4
-5/13*p = -4 // : -5/13
p = -4/(-5/13)
p = 52/5
p = 52/5
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