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g in (-oo:+oo)
g^2 = 16/100 // - 16/100
g^2-(16/100) = 0
g^2-4/25 = 0
1*g^2 = 4/25 // : 1
g^2 = 4/25
g^2 = 4/25 // ^ 1/2
abs(g) = 2/5
g = 2/5 or g = -2/5
g in { 2/5, -2/5 }
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