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d in (-oo:+oo)
2-d-(7*d) = -6 // + 6
2-d-(7*d)+6 = 0
2-d-7*d+6 = 0
8-8*d = 0 // - 8
-8*d = -8 // : -8
d = -8/(-8)
d = 1
d = 1
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