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3*x^2-((6/5)*x) = 0
3*x^2+(-6/5)*x = 0
3*x^2-6/5*x = 0
DELTA = (-6/5)^2-(0*3*4)
DELTA = 36/25
DELTA > 0
x = ((36/25)^(1/2)+6/5)/(2*3) or x = (6/5-(36/25)^(1/2))/(2*3)
x = 2/5 or x = 0
x in { 0, 2/5 }
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