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g in (-oo:+oo)
g/2 = 2/8 // - 2/8
g/2-(2/8) = 0
g/2-1/4 = 0
1/2*g-1/4 = 0 // + 1/4
1/2*g = 1/4 // : 1/2
g = 1/4/1/2
g = 1/2
g = 1/2
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