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