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d in (-oo:+oo)
-2/3 = 4*d+4*d+4 // - 4*d+4*d+4
-(4*d)-(4*d)-2/3-4 = 0
-4*d-4*d-2/3-4 = 0
-8*d-14/3 = 0 // + 14/3
-8*d = 14/3 // : -8
d = 14/3/(-8)
d = -7/12
d = -7/12
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