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d in (-oo:+oo)
(3/7)*d+7*d+1/2 = -617/14 // + -617/14
(3/7)*d+7*d+1/2-(-617/14) = 0
(3/7)*d+7*d+1/2+617/14 = 0
52/7*d+312/7 = 0 // - 312/7
52/7*d = -312/7 // : 52/7
d = -312/7/52/7
d = -6
d = -6
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