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x in (-oo:+oo)
-27 = (x^2)/3-((3*x^1)/3)-27 // - (x^2)/3-((3*x^1)/3)-27
(3*x^1)/3-((x^2)/3)-27+27 = 0
(3*x)/3-((x^2)/3)-27+27 = 0
x-1/3*x^2 = 0
DELTA = 1^2-(-1/3*0*4)
DELTA = 1
DELTA > 0
x = (1^(1/2)-1)/(-1/3*2) or x = (-1^(1/2)-1)/(-1/3*2)
x = 0 or x = 3
x in { 0, 3 }
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