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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
(3*g-12)/g = -1/2 // + -1/2
(3*g-12)/g-(-1/2) = 0
(3*g-12)/g+1/2 = 0
(2*(3*g-12))/(2*g)+(1*g)/(2*g) = 0
2*(3*g-12)+1*g = 0
7*g-24 = 0
(7*g-24)/(2*g) = 0
(7*g-24)/(2*g) = 0 // * 2*g
7*g-24 = 0
7*g-24 = 0 // + 24
7*g = 24 // : 7
g = 24/7
g = 24/7
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