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