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n in (-oo:+oo)
2*(5-((1/2)*n)) = 0
2*((-1/2)*n+5) = 0
2*(5-1/2*n) = 0
( 2 )
2 = 0
n belongs to the empty set
( 5-1/2*n )
5-1/2*n = 0 // - 5
-1/2*n = -5 // : -1/2
n = -5/(-1/2)
n = 10
n = 10
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