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d in (-oo:+oo)
(5/7)*d+2 = 6*d+251/70 // - 6*d+251/70
(5/7)*d-(6*d)-(251/70)+2 = 0
(5/7)*d-6*d-251/70+2 = 0
-37/7*d-111/70 = 0 // + 111/70
-37/7*d = 111/70 // : -37/7
d = 111/70/(-37/7)
d = -3/10
d = -3/10
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