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y in (-oo:+oo)
(4/5)*y^2+(7/6)*y = 0
4/5*y^2+7/6*y = 0
DELTA = (7/6)^2-(0*4/5*4)
DELTA = 49/36
DELTA > 0
y = ((49/36)^(1/2)-7/6)/(4/5*2) or y = (-(49/36)^(1/2)-7/6)/(4/5*2)
y = 0 or y = -35/24
y in { -35/24, 0 }
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