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