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y in (-oo:+oo)
(y/3)*y+3*y-(2/2)-2 = 0
(y/3)*y+3*y-2-1 = 0
1/3*y^2+3*y-3 = 0
DELTA = 3^2-(-3*1/3*4)
DELTA = 13
DELTA > 0
y = (13^(1/2)-3)/(1/3*2) or y = (-13^(1/2)-3)/(1/3*2)
y = 3/2*(13^(1/2)-3) or y = -3/2*(13^(1/2)+3)
y in { -3/2*(13^(1/2)+3), 3/2*(13^(1/2)-3) }
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