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p in (-oo:+oo)
(-4/9)*p = 16/9 // - 16/9
(-4/9)*p-(16/9) = 0
(-4/9)*p-16/9 = 0
-4/9*p-16/9 = 0 // + 16/9
-4/9*p = 16/9 // : -4/9
p = 16/9/(-4/9)
p = -4
p = -4
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