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x^2-((25/3)*x) = 0
x^2+(-25/3)*x = 0
x^2-25/3*x = 0
DELTA = (-25/3)^2-(0*1*4)
DELTA = 625/9
DELTA > 0
x = ((625/9)^(1/2)+25/3)/(1*2) or x = (25/3-(625/9)^(1/2))/(1*2)
x = 25/3 or x = 0
x in { 0, 25/3 }
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