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