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d in (-oo:+oo)
1 = 1/6-((7/3)*d) // - 1/6-((7/3)*d)
(7/3)*d-(1/6)+1 = 0
(7/3)*d-1/6+1 = 0
7/3*d+5/6 = 0 // - 5/6
7/3*d = -5/6 // : 7/3
d = -5/6/7/3
d = -5/14
d = -5/14
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