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x in (-oo:+oo)
((30*x)/6)*x-27*x = 0
5*x^2-27*x = 0
DELTA = (-27)^2-(0*4*5)
DELTA = 729
DELTA > 0
x = (729^(1/2)+27)/(2*5) or x = (27-729^(1/2))/(2*5)
x = 27/5 or x = 0
x in { 0, 27/5 }
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