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g in (-oo:+oo)
(1/4)*(8*g-20) = 2*(g-1)-3 // - 2*(g-1)-3
(1/4)*(8*g-20)-(2*(g-1))+3 = 0
(1/4)*(8*g-20)-2*(g-1)+3 = 0
1/4*(8*g-20)-2*(g-1)+3 = 0
1/4*(8*g-20)-2*(g-1)+3 = 0
3-3 = 0
0 = 0
0 = 0
g belongs to the empty set
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