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p in (-oo:+oo)
-4*p = 20/30 // - 20/30
-4*p-(20/30) = 0
-4*p-2/3 = 0
-4*p-2/3 = 0 // + 2/3
-4*p = 2/3 // : -4
p = 2/3/(-4)
p = -1/6
p = -1/6
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