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d in (-oo:+oo)
7-7*d = 6*d-6 // - 6*d-6
6-7*d-(6*d)+7 = 0
6-7*d-6*d+7 = 0
13-13*d = 0 // - 13
-13*d = -13 // : -13
d = -13/(-13)
d = 1
d = 1
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