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