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4*x^2-((2*x)/4)+x-(3/3) = x^2 // - x^2
4*x^2-x^2-((2*x)/4)+x-(3/3) = 0
4*x^2-x^2+(-1/2)*x+x-1 = 0
3*x^2+1/2*x-1 = 0
DELTA = (1/2)^2-(-1*3*4)
DELTA = 49/4
DELTA > 0
x = ((49/4)^(1/2)-1/2)/(2*3) or x = (-(49/4)^(1/2)-1/2)/(2*3)
x = 1/2 or x = -2/3
x in { -2/3, 1/2 }
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