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(x^2)/12+x+13/6 = 0
1/12*x^2+x+13/6 = 0
DELTA = 1^2-(1/12*13/6*4)
DELTA = 5/18
DELTA > 0
x = ((5/18)^(1/2)-1)/(1/12*2) or x = (-(5/18)^(1/2)-1)/(1/12*2)
x = 6*((5/18)^(1/2)-1) or x = -6*((5/18)^(1/2)+1)
x in { -6*((5/18)^(1/2)+1), 6*((5/18)^(1/2)-1) }
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