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G in (-oo:+oo)
G^2 = 169/36 // - 169/36
G^2-(169/36) = 0
G^2-169/36 = 0
1*G^2 = 169/36 // : 1
G^2 = 169/36
G^2 = 169/36 // ^ 1/2
abs(G) = 13/6
G = 13/6 or G = -13/6
G in { 13/6, -13/6 }
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