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g in (-oo:+oo)
12 = (4/8)*g // - (4/8)*g
12-((4/8)*g) = 0
(-1/2)*g+12 = 0
12-1/2*g = 0 // - 12
-1/2*g = -12 // : -1/2
g = -12/(-1/2)
g = 24
g = 24
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