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d in (-oo:+oo)
(6/7)*d-5 = -29/7 // + -29/7
(6/7)*d-(-29/7)-5 = 0
(6/7)*d+29/7-5 = 0
6/7*d-6/7 = 0 // + 6/7
6/7*d = 6/7 // : 6/7
d = 6/7/6/7
d = 1
d = 1
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