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y in (-oo:+oo)
y-((2/6)*y^2)-((3/4)*y^2)-(4*y) = 0
(-1/3)*y^2+(-3/4)*y^2+y-4*y = 0
-13/12*y^2-3*y = 0
DELTA = (-3)^2-(-13/12*0*4)
DELTA = 9
DELTA > 0
y = (9^(1/2)+3)/(-13/12*2) or y = (3-9^(1/2))/(-13/12*2)
y = -36/13 or y = 0
y in { -36/13, 0 }
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