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p in (-oo:+oo)
(-7/11)*p = -9 // + 9
(-7/11)*p+9 = 0
9-7/11*p = 0 // - 9
-7/11*p = -9 // : -7/11
p = -9/(-7/11)
p = 99/7
p = 99/7
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