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