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n in (-oo:+oo)
n^2 = 25/49 // - 25/49
n^2-(25/49) = 0
n^2-25/49 = 0
1*n^2 = 25/49 // : 1
n^2 = 25/49
n^2 = 25/49 // ^ 1/2
abs(n) = 5/7
n = 5/7 or n = -5/7
n in { 5/7, -5/7 }
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