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