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A in (-oo:+oo)
A^2 = 16/121 // - 16/121
A^2-(16/121) = 0
A^2-16/121 = 0
1*A^2 = 16/121 // : 1
A^2 = 16/121
A^2 = 16/121 // ^ 1/2
abs(A) = 4/11
A = 4/11 or A = -4/11
A in { 4/11, -4/11 }
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