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y in (-oo:+oo)
(6/13)*y^2-((8/5)*y) = 0
(6/13)*y^2+(-8/5)*y = 0
6/13*y^2-8/5*y = 0
DELTA = (-8/5)^2-(0*6/13*4)
DELTA = 64/25
DELTA > 0
y = ((64/25)^(1/2)+8/5)/(6/13*2) or y = (8/5-(64/25)^(1/2))/(6/13*2)
y = 52/15 or y = 0
y in { 0, 52/15 }
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