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x in (-oo:+oo)
y = (x/2-6)^2 // - (x/2-6)^2
y-(x/2-6)^2 = 0
y-1*(1/2*x-6)^2 = 0
y-1*(1/2*x-6)^2 = 0
6*x-1/4*x^2+y-36 = 0
6*x-1/4*x^2+y-36 = 0
6*x-1/4*x^2+y-36 = 0
DELTA = 6^2-(-1/4*4*(y-36))
DELTA = y
y = 0
DELTA = 0 <=> t_3 = 0
x = -6/(-1/4*2) i y = 0
x = 12 i y = 0
( x = (y^(1/2)-6)/(-1/4*2) or x = (-y^(1/2)-6)/(-1/4*2) ) i y > 0
( x = -2*(y^(1/2)-6) or x = 2*(y^(1/2)+6) ) i y > 0
y+0 > 0
y > 0
y+0 > 0 // - 0
y > 0
x in { 12, -2*(y^(1/2)-6), 2*(y^(1/2)+6) }
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