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