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(1/3)*x-(4*x^2) = 0
(1/3)*x-4*x^2 = 0
1/3*x-4*x^2 = 0
DELTA = (1/3)^2-(-4*0*4)
DELTA = 1/9
DELTA > 0
x = ((1/9)^(1/2)-1/3)/(-4*2) or x = (-(1/9)^(1/2)-1/3)/(-4*2)
x = 0 or x = 1/12
x in { 0, 1/12 }
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