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D in (-oo:+oo)
(1/8)*(3*D-2) = 1/4 // - 1/4
(1/8)*(3*D-2)-(1/4) = 0
(1/8)*(3*D-2)-1/4 = 0
1/8*(3*D-2)-1/4 = 0
(1/8*4*(3*D-2))/4-1/4 = 0
1/8*4*(3*D-2)-1 = 0
3/2*D-2 = 0
(3/2*D-2)/4 = 0
(3/2*D-2)/4 = 0 // * 4
3/2*D-2 = 0
3/2*D-2 = 0 // + 2
3/2*D = 2 // : 3/2
D = 2/3/2
D = 4/3
D = 4/3
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