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d in (-oo:+oo)
(-1/7)*d+2/7 = 10/7 // - 10/7
(-1/7)*d+2/7-(10/7) = 0
(-1/7)*d+2/7-10/7 = 0
-1/7*d-8/7 = 0 // + 8/7
-1/7*d = 8/7 // : -1/7
d = 8/7/(-1/7)
d = -8
d = -8
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