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