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y in (-oo:+oo)
((3*y)/6)*y+3*14*y+7/5 = 0
1/2*y^2+42*y+7/5 = 0
DELTA = 42^2-(1/2*7/5*4)
DELTA = 8806/5
DELTA > 0
y = ((8806/5)^(1/2)-42)/(1/2*2) or y = (-(8806/5)^(1/2)-42)/(1/2*2)
y = (8806/5)^(1/2)-42 or y = -((8806/5)^(1/2)+42)
y in { -((8806/5)^(1/2)+42), (8806/5)^(1/2)-42 }
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