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