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d in (-oo:+oo)
2/9-((1/7)*d) = -85/63 // + -85/63
2/9-((1/7)*d)-(-85/63) = 0
(-1/7)*d+2/9+85/63 = 0
11/7-1/7*d = 0 // - 11/7
-1/7*d = -11/7 // : -1/7
d = -11/7/(-1/7)
d = 11
d = 11
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