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x in (-oo:+oo)
(1/2)*x^2-(2*x) = 6 // - 6
(1/2)*x^2-(2*x)-6 = 0
(1/2)*x^2-2*x-6 = 0
1/2*x^2-2*x-6 = 0
DELTA = (-2)^2-(-6*1/2*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)+2)/(1/2*2) or x = (2-16^(1/2))/(1/2*2)
x = 6 or x = -2
x in { -2, 6 }
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