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p in (-oo:+oo)
(4/7)*p-4 = (2/3)*p // - (2/3)*p
(4/7)*p-((2/3)*p)-4 = 0
(4/7)*p+(-2/3)*p-4 = 0
-2/21*p-4 = 0 // + 4
-2/21*p = 4 // : -2/21
p = 4/(-2/21)
p = -42
p = -42
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