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(4/5)*x^2-(2*x)+4/5 = 0
(4/5)*x^2-2*x+4/5 = 0
4/5*x^2-2*x+4/5 = 0
DELTA = (-2)^2-(4/5*4/5*4)
DELTA = 36/25
DELTA > 0
x = ((36/25)^(1/2)+2)/(4/5*2) or x = (2-(36/25)^(1/2))/(4/5*2)
x = 2 or x = 1/2
x in { 1/2, 2 }
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