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p in (-oo:+oo)
(1/4)*(8*p-20) = 0
1/4*(8*p-20) = 0
( 1/4 )
1/4 = 0
p belongs to the empty set
( 8*p-20 )
8*p-20 = 0 // + 20
8*p = 20 // : 8
p = 20/8
p = 5/2
p = 5/2
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