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