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p in (-oo:+oo)
(-7/13)*p = -4 // + 4
(-7/13)*p+4 = 0
4-7/13*p = 0 // - 4
-7/13*p = -4 // : -7/13
p = -4/(-7/13)
p = 52/7
p = 52/7
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