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d in (-oo:+oo)
(d-1)/4 = 2*d+6 // - 2*d+6
(d-1)/4-(2*d)-6 = 0
(d-1)/4-2*d-6 = 0
(d-1)/4+(-2*4*d)/4+(-6*4)/4 = 0
d-2*4*d-6*4-1 = 0
-7*d-24-1 = 0
-7*d-25 = 0
(-7*d-25)/4 = 0
(-7*d-25)/4 = 0 // * 4
-7*d-25 = 0
-7*d-25 = 0 // + 25
-7*d = 25 // : -7
d = 25/(-7)
d = -25/7
d = -25/7
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