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a in (-oo:+oo)
a^2 = 25/9 // - 25/9
a^2-(25/9) = 0
a^2-25/9 = 0
1*a^2 = 25/9 // : 1
a^2 = 25/9
a^2 = 25/9 // ^ 1/2
abs(a) = 5/3
a = 5/3 or a = -5/3
a in { 5/3, -5/3 }
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