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p in (-oo:+oo)
(-2/3)*p-8 = 4 // - 4
(-2/3)*p-8-4 = 0
-2/3*p-12 = 0 // + 12
-2/3*p = 12 // : -2/3
p = 12/(-2/3)
p = -18
p = -18
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