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g in (-oo:+oo)
7 = 1-(g/(-2)) // - 1-(g/(-2))
g/(-2)-1+7 = 0
6-1/2*g = 0 // - 6
-1/2*g = -6 // : -1/2
g = -6/(-1/2)
g = 12
g = 12
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