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x in (-oo:+oo)
x^2+(3/5)*x+2/25 = 0
x^2+3/5*x+2/25 = 0
DELTA = (3/5)^2-(2/25*1*4)
DELTA = 1/25
DELTA > 0
x = ((1/25)^(1/2)-3/5)/(1*2) or x = (-(1/25)^(1/2)-3/5)/(1*2)
x = -1/5 or x = -2/5
x in { -2/5, -1/5 }
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