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n in (-oo:+oo)
(1/2)*(100*n-50) = 0
1/2*(100*n-50) = 0
( 1/2 )
1/2 = 0
n belongs to the empty set
( 100*n-50 )
100*n-50 = 0 // + 50
100*n = 50 // : 100
n = 50/100
n = 1/2
n = 1/2
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