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x in (-oo:+oo)
x = (-1/12)*(x-1)^2-5 // - (-1/12)*(x-1)^2-5
x-((-1/12)*(x-1)^2)+5 = 0
(1/12)*(x-1)^2+x+5 = 0
1/12*(x-1)^2+x+5 = 0
1/12*(x-1)^2+x+5 = 0
1/12*x^2+5/6*x+1/12+5 = 0
1/12*x^2+5/6*x+61/12 = 0
1/12*x^2+5/6*x+61/12 = 0
1/6*(1/2*x^2+5*x+61/2) = 0
1/2*x^2+5*x+61/2 = 0
DELTA = 5^2-(1/2*4*61/2)
DELTA = -36
DELTA < 0
1/6 = 0
1/6 = 0
1/6 = 0 // * 6
1 = 0
x belongs to the empty set
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