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x in (-oo:+oo)
(x^2)/8+x-6 = -6 // + 6
(x^2)/8+x-6+6 = 0
1/8*x^2+x = 0
DELTA = 1^2-(0*1/8*4)
DELTA = 1
DELTA > 0
x = (1^(1/2)-1)/(1/8*2) or x = (-1^(1/2)-1)/(1/8*2)
x = 0 or x = -8
x in { -8, 0 }
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