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