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2*x-((x/6)*x)+1/3-4 = -2 // + 2
2*x-((x/6)*x)+1/3-4+2 = 0
(-1/6)*x^2+2*x+1/3-4+2 = 0
2*x-1/6*x^2-5/3 = 0
DELTA = 2^2-(-5/3*(-1/6)*4)
DELTA = 26/9
DELTA > 0
x = ((26/9)^(1/2)-2)/(-1/6*2) or x = (-(26/9)^(1/2)-2)/(-1/6*2)
x = -3*((26/9)^(1/2)-2) or x = 3*((26/9)^(1/2)+2)
x in { -3*((26/9)^(1/2)-2), 3*((26/9)^(1/2)+2) }
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