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D( g )
g+2 = 0
0.5*g-1 = 0
g+2 = 0
g+2 = 0
g+2 = 0 // - 2
g = -2
0.5*g-1 = 0
0.5*g-1 = 0
0.5*g-1 = 0 // + 1
0.5*g = 1 // : 0.5
g = 1/0.5
g = 2
g in (-oo:-2) U (-2:2) U (2:+oo)
4.5/(g+2) = 3/(0.5*g-1) // - 3/(0.5*g-1)
4.5/(g+2)-(3/(0.5*g-1)) = 0
4.5/(g+2)-3*(0.5*g-1)^-1 = 0
4.5/(g+2)-3/(0.5*g-1) = 0
(4.5*(0.5*g-1))/((g+2)*(0.5*g-1))+(-3*(g+2))/((g+2)*(0.5*g-1)) = 0
4.5*(0.5*g-1)-3*(g+2) = 0
-0.75*g-10.5 = 0
(-0.75*g-10.5)/((g+2)*(0.5*g-1)) = 0
(-0.75*g-10.5)/((g+2)*(0.5*g-1)) = 0 // * (g+2)*(0.5*g-1)
-0.75*g-10.5 = 0
-0.75*g-10.5 = 0 // + 10.5
-0.75*g = 10.5 // : -0.75
g = 10.5/(-0.75)
g = -14
g = -14
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