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(1/3)*x^2+4*x-3 = 0
1/3*x^2+4*x-3 = 0
DELTA = 4^2-(-3*1/3*4)
DELTA = 20
DELTA > 0
x = (20^(1/2)-4)/(1/3*2) or x = (-20^(1/2)-4)/(1/3*2)
x = 3/2*(2*5^(1/2)-4) or x = 3/2*(-2*5^(1/2)-4)
x in { 3/2*(-2*5^(1/2)-4), 3/2*(2*5^(1/2)-4) }
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