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a in (-oo:+oo)
a^2 = 64/225 // - 64/225
a^2-(64/225) = 0
a^2-64/225 = 0
1*a^2 = 64/225 // : 1
a^2 = 64/225
a^2 = 64/225 // ^ 1/2
abs(a) = 8/15
a = 8/15 or a = -8/15
a in { 8/15, -8/15 }
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