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s in (-oo:+oo)
s^2-(64/121) = 0
s^2-64/121 = 0
1*s^2 = 64/121 // : 1
s^2 = 64/121
s^2 = 64/121 // ^ 1/2
abs(s) = 8/11
s = 8/11 or s = -8/11
s in { 8/11, -8/11 }
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