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y in (-oo:+oo)
(3/5)*(10*y-20) = 0
3/5*(10*y-20) = 0
( 10*y-20 )
10*y-20 = 0 // + 20
10*y = 20 // : 10
y = 20/10
y = 2
( 3/5 )
3/5 = 0
y belongs to the empty set
y = 2
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