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y in (-oo:+oo)
(8*y-(4/7))*((14/10)*y-5) = 0
(8*y-4/7)*((14/10)*y-5) = 0
(8*y-4/7)*(7/5*y-5) = 0
( 7/5*y-5 )
7/5*y-5 = 0 // + 5
7/5*y = 5 // : 7/5
y = 5/7/5
y = 25/7
( 8*y-4/7 )
8*y-4/7 = 0 // + 4/7
8*y = 4/7 // : 8
y = 4/7/8
y = 1/14
y in { 25/7, 1/14 }
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