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d in (-oo:+oo)
d^2 = 9/16 // - 9/16
d^2-(9/16) = 0
d^2-9/16 = 0
1*d^2 = 9/16 // : 1
d^2 = 9/16
d^2 = 9/16 // ^ 1/2
abs(d) = 3/4
d = 3/4 or d = -3/4
d in { 3/4, -3/4 }
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