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d in (-oo:+oo)
(5/7)*d+2*d+3/7 = 71/77 // - 71/77
(5/7)*d+2*d+3/7-(71/77) = 0
(5/7)*d+2*d+3/7-71/77 = 0
19/7*d-38/77 = 0 // + 38/77
19/7*d = 38/77 // : 19/7
d = 38/77/19/7
d = 2/11
d = 2/11
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