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x in (-oo:+oo)
(x^2)/54+(5*x)/18 = 0
1/54*x^2+5/18*x = 0
DELTA = (5/18)^2-(0*1/54*4)
DELTA = 25/324
DELTA > 0
x = ((25/324)^(1/2)-5/18)/(1/54*2) or x = (-(25/324)^(1/2)-5/18)/(1/54*2)
x = 0 or x = -15
x in { -15, 0 }
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