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p in (-oo:+oo)
(-1/13)*p = 5/4 // - 5/4
(-1/13)*p-(5/4) = 0
(-1/13)*p-5/4 = 0
-1/13*p-5/4 = 0 // + 5/4
-1/13*p = 5/4 // : -1/13
p = 5/4/(-1/13)
p = -65/4
p = -65/4
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