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x in (-oo:+oo)
(x^2)/9+5*x = 0
1/9*x^2+5*x = 0
DELTA = 5^2-(0*1/9*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)-5)/(1/9*2) or x = (-25^(1/2)-5)/(1/9*2)
x = 0 or x = -45
x in { -45, 0 }
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