c^2/20-c/4+1/5=0

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Solution for c^2/20-c/4+1/5=0 equation: 


c in (-oo:+oo)

(c^2)/20-(c/4)+1/5 = 0

1/20*c^2-1/4*c+1/5 = 0

DELTA = (-1/4)^2-(1/20*1/5*4)

DELTA = 9/400

DELTA > 0

c = ((9/400)^(1/2)+1/4)/(1/20*2) or c = (1/4-(9/400)^(1/2))/(1/20*2)

c = 4 or c = 1

c in { 1, 4 }

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