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