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x in (-oo:+oo)
t_1 = y^2-2/3*y-14/9
t_1+x^2-2/3*x = 0
t_1+x^2-2/3*x = 0
DELTA = (-2/3)^2-(1*4*t_1)
DELTA = 4/9-4*t_1
4/9-4*t_1 = 0
4/9-4*t_1 = 0 // - 4/9
-4*t_1 = -4/9 // : -4
t_1 = -4/9/(-4)
t_1 = 1/9
DELTA = 0 <=> t_2 = 1/9
x = 2/3/(1*2) i t_1 = 1/9
x = 1/3 i t_1 = 1/9
( x = ((4/9-4*t_1)^(1/2)+2/3)/(1*2) or x = (2/3-(4/9-4*t_1)^(1/2))/(1*2) ) i t_1 > 1/9
( x = ((4/9-4*t_1)^(1/2)+2/3)/2 or x = (2/3-(4/9-4*t_1)^(1/2))/2 ) i t_1 > 1/9
t_1-1/9 > 0
t_1-1/9 > 0 // + 1/9
t_1 > 1/9
x in { 1/3, ((4/9-4*(y^2-2/3*y-14/9))^(1/2)+2/3)/2, (2/3-(4/9-4*(y^2-2/3*y-14/9))^(1/2))/2 }
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