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(-1/12)*x^2+2*x+4 = 0
2*x-1/12*x^2+4 = 0
DELTA = 2^2-(-1/12*4*4)
DELTA = 16/3
DELTA > 0
x = ((16/3)^(1/2)-2)/(-1/12*2) or x = (-(16/3)^(1/2)-2)/(-1/12*2)
x = -6*((16/3)^(1/2)-2) or x = 6*((16/3)^(1/2)+2)
x in { -6*((16/3)^(1/2)-2), 6*((16/3)^(1/2)+2) }
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