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d in (-oo:+oo)
8-2*d = 20/7-((5/7)*d) // - 20/7-((5/7)*d)
(5/7)*d-2*d-(20/7)+8 = 0
(5/7)*d-2*d-20/7+8 = 0
36/7-9/7*d = 0 // - 36/7
-9/7*d = -36/7 // : -9/7
d = -36/7/(-9/7)
d = 4
d = 4
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