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d in (-oo:+oo)
d-(7*d)-2 = -44/7 // + -44/7
d-(7*d)-(-44/7)-2 = 0
d-7*d+44/7-2 = 0
30/7-6*d = 0 // - 30/7
-6*d = -30/7 // : -6
d = -30/7/(-6)
d = 5/7
d = 5/7
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