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x in (-oo:+oo)
y = (1/2)*x^2-(6*x)-3 // - (1/2)*x^2-(6*x)-3
6*x-((1/2)*x^2)+y+3 = 0
(-1/2)*x^2+6*x+y+3 = 0
6*x-1/2*x^2+y+3 = 0
DELTA = 6^2-(-1/2*4*(y+3))
DELTA = 2*(y+3)+36
2*(y+3)+36 = 0
2*(y+3)+36 = 0
2*y+42 = 0
2*y+42 = 0
2*y+42 = 0 // - 42
2*y = -42 // : 2
y = -42/2
y = -21
DELTA = 0 <=> t_1 = -21
x = -6/(-1/2*2) i y = -21
x = 6 i y = -21
( x = ((2*(y+3)+36)^(1/2)-6)/(-1/2*2) or x = (-(2*(y+3)+36)^(1/2)-6)/(-1/2*2) ) i y > -21
( x = 6-(2*(y+3)+36)^(1/2) or x = (2*(y+3)+36)^(1/2)+6 ) i y > -21
y+21 > 0
y+21 > 0 // - 21
y > -21
x in { 6, 6-(2*(y+3)+36)^(1/2), (2*(y+3)+36)^(1/2)+6 }
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