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(6*x^2)/5-((4*x^1)/5) = 0
(6*x^2)/5+(-4/5)*x = 0
6/5*x^2-4/5*x = 0
DELTA = (-4/5)^2-(0*6/5*4)
DELTA = 16/25
DELTA > 0
x = ((16/25)^(1/2)+4/5)/(6/5*2) or x = (4/5-(16/25)^(1/2))/(6/5*2)
x = 2/3 or x = 0
x in { 0, 2/3 }
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