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(2*y^2)/3+(5*y^1)/3-12 = 0
(2*y^2)/3+(5*y)/3-12 = 0
2/3*y^2+5/3*y-12 = 0
DELTA = (5/3)^2-(-12*2/3*4)
DELTA = 313/9
DELTA > 0
y = ((313/9)^(1/2)-5/3)/(2/3*2) or y = (-(313/9)^(1/2)-5/3)/(2/3*2)
y = 3/4*((313/9)^(1/2)-5/3) or y = -3/4*((313/9)^(1/2)+5/3)
y in { -3/4*((313/9)^(1/2)+5/3), 3/4*((313/9)^(1/2)-5/3) }
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