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p in (-oo:+oo)
(1/4)*(16-(4*p)) = 0
(1/4)*(16-4*p) = 0
1/4*(16-4*p) = 0
( 1/4 )
1/4 = 0
p belongs to the empty set
( 16-4*p )
16-4*p = 0 // - 16
-4*p = -16 // : -4
p = -16/(-4)
p = 4
p = 4
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