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d in (-oo:+oo)
(2/7)*d-2 = 3*d-(45/7) // - 3*d-(45/7)
(2/7)*d-(3*d)+45/7-2 = 0
(2/7)*d-3*d+45/7-2 = 0
31/7-19/7*d = 0 // - 31/7
-19/7*d = -31/7 // : -19/7
d = -31/7/(-19/7)
d = 31/19
d = 31/19
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