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x in (-oo:+oo)
((5*(2*x-8))/3)/(-8) = 0
(5*(2*x-8))/(-8*3) = 0
( 2*x-8 )
2*x-8 = 0 // + 8
2*x = 8 // : 2
x = 8/2
x = 4
( 5 )
5 = 0
x belongs to the empty set
x = 4
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