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x*x-(1*(1/12)*x)-(1*(3/8)) = 0
x*x+(-1/12)*x-3/8 = 0
x^2-1/12*x-3/8 = 0
DELTA = (-1/12)^2-(-3/8*1*4)
DELTA = 217/144
DELTA > 0
x = ((217/144)^(1/2)+1/12)/(1*2) or x = (1/12-(217/144)^(1/2))/(1*2)
x = ((217/144)^(1/2)+1/12)/2 or x = (1/12-(217/144)^(1/2))/2
x in { (1/12-(217/144)^(1/2))/2, ((217/144)^(1/2)+1/12)/2 }
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