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g in (-oo:+oo)
(1/4)*g-3 = g-9 // - g-9
(1/4)*g-g-3+9 = 0
6-3/4*g = 0 // - 6
-3/4*g = -6 // : -3/4
g = -6/(-3/4)
g = 8
g = 8
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