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a in (-oo:+oo)
a^2-(25/36) = 0
a^2-25/36 = 0
1*a^2 = 25/36 // : 1
a^2 = 25/36
a^2 = 25/36 // ^ 1/2
abs(a) = 5/6
a = 5/6 or a = -5/6
a in { 5/6, -5/6 }
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