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(1/12)*x^2-((1/6)*x) = 1 // - 1
(1/12)*x^2-((1/6)*x)-1 = 0
(1/12)*x^2+(-1/6)*x-1 = 0
1/12*x^2-1/6*x-1 = 0
DELTA = (-1/6)^2-(-1*1/12*4)
DELTA = 13/36
DELTA > 0
x = ((13/36)^(1/2)+1/6)/(1/12*2) or x = (1/6-(13/36)^(1/2))/(1/12*2)
x = 6*((13/36)^(1/2)+1/6) or x = 6*(1/6-(13/36)^(1/2))
x in { 6*(1/6-(13/36)^(1/2)), 6*((13/36)^(1/2)+1/6) }
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