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d in (-oo:+oo)
(6/7)*d+2/9 = 368/441 // - 368/441
(6/7)*d+2/9-(368/441) = 0
(6/7)*d+2/9-368/441 = 0
6/7*d-30/49 = 0 // + 30/49
6/7*d = 30/49 // : 6/7
d = 30/49/6/7
d = 5/7
d = 5/7
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