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