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p in (-oo:+oo)
(-15/11)*p = -9 // + 9
(-15/11)*p+9 = 0
9-15/11*p = 0 // - 9
-15/11*p = -9 // : -15/11
p = -9/(-15/11)
p = 33/5
p = 33/5
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