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f in (-oo:+oo)
(1/4)*(20*f-2) = 0
1/4*(20*f-2) = 0
( 1/4 )
1/4 = 0
f belongs to the empty set
( 20*f-2 )
20*f-2 = 0 // + 2
20*f = 2 // : 20
f = 2/20
f = 1/10
f = 1/10
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