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p in (-oo:+oo)
(7/4)*p-(2*p) = 1/2 // - 1/2
(7/4)*p-(2*p)-(1/2) = 0
(7/4)*p-2*p-1/2 = 0
-1/4*p-1/2 = 0 // + 1/2
-1/4*p = 1/2 // : -1/4
p = 1/2/(-1/4)
p = -2
p = -2
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