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p in (-oo:+oo)
(4/13)*p = -16/5 // + -16/5
(4/13)*p-(-16/5) = 0
(4/13)*p+16/5 = 0
4/13*p+16/5 = 0 // - 16/5
4/13*p = -16/5 // : 4/13
p = -16/5/4/13
p = -52/5
p = -52/5
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