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a in (-oo:+oo)
(2*a-(1/5))*(2*a-(1/5)) = 0
(2*a-1/5)*(2*a-1/5) = 0
(2*a-1/5)^2 = 0
2*a-1/5 = 0 // + 1/5
2*a = 1/5 // : 2
a = 1/5/2
a = 1/10
a in { 1/10, 1/10 }
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