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a in (-oo:+oo)
(3/5)*(2*a-1) = 0
3/5*(2*a-1) = 0
( 2*a-1 )
2*a-1 = 0 // + 1
2*a = 1 // : 2
a = 1/2
( 3/5 )
3/5 = 0
a belongs to the empty set
a = 1/2
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