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