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d in (-oo:+oo)
(2/7)*d+6 = d+412/77 // - d+412/77
(2/7)*d-d-(412/77)+6 = 0
(2/7)*d-d-412/77+6 = 0
50/77-5/7*d = 0 // - 50/77
-5/7*d = -50/77 // : -5/7
d = -50/77/(-5/7)
d = 10/11
d = 10/11
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