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