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x in (-oo:+oo)
x = ((-10*x)/27)*x // - ((-10*x)/27)*x
x-(((-10*x)/27)*x) = 0
(10/27)*x^2+x = 0
10/27*x^2+x = 0
DELTA = 1^2-(0*10/27*4)
DELTA = 1
DELTA > 0
x = (1^(1/2)-1)/(10/27*2) or x = (-1^(1/2)-1)/(10/27*2)
x = 0 or x = -27/10
x in { -27/10, 0 }
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