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g in (-oo:+oo)
2 = g/(2*4) // - g/(2*4)
2-(g/(2*4)) = 0
(-1/8)*g+2 = 0
2-1/8*g = 0 // - 2
-1/8*g = -2 // : -1/8
g = -2/(-1/8)
g = 16
g = 16
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