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g in (-oo:+oo)
(1/2)*g+6 = 2*g // - 2*g
(1/2)*g-(2*g)+6 = 0
(1/2)*g-2*g+6 = 0
6-3/2*g = 0 // - 6
-3/2*g = -6 // : -3/2
g = -6/(-3/2)
g = 4
g = 4
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