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