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p in (-oo:+oo)
(-15/13)*p = -9 // + 9
(-15/13)*p+9 = 0
9-15/13*p = 0 // - 9
-15/13*p = -9 // : -15/13
p = -9/(-15/13)
p = 39/5
p = 39/5
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