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y in (-oo:+oo)
((3/4)*y-(1/4))*((1/2)*y-(3/20)) = 0
((3/4)*y-1/4)*((1/2)*y-3/20) = 0
(3/4*y-1/4)*(1/2*y-3/20) = 0
( 1/2*y-3/20 )
1/2*y-3/20 = 0 // + 3/20
1/2*y = 3/20 // : 1/2
y = 3/20/1/2
y = 3/10
( 3/4*y-1/4 )
3/4*y-1/4 = 0 // + 1/4
3/4*y = 1/4 // : 3/4
y = 1/4/3/4
y = 1/3
y in { 3/10, 1/3 }
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