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D in (-oo:+oo)
(1/4)*(D-1) = 16 // - 16
(1/4)*(D-1)-16 = 0
1/4*(D-1)-16 = 0
1/4*(D-1)-16 = 0
1/4*D-65/4 = 0
1/4*D-65/4 = 0
1/4*D-65/4 = 0 // + 65/4
1/4*D = 65/4 // : 1/4
D = 65/4/1/4
D = 65
D = 65
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