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p in (-oo:+oo)
(-5/9)*p-17 = 13 // - 13
(-5/9)*p-17-13 = 0
-5/9*p-30 = 0 // + 30
-5/9*p = 30 // : -5/9
p = 30/(-5/9)
p = -54
p = -54
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