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x in (-oo:+oo)
x^2-(x/20) = 0
x^2-1/20*x = 0
DELTA = (-1/20)^2-(0*1*4)
DELTA = 1/400
DELTA > 0
x = ((1/400)^(1/2)+1/20)/(1*2) or x = (1/20-(1/400)^(1/2))/(1*2)
x = 1/20 or x = 0
x in { 0, 1/20 }
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