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d in (-oo:+oo)
97 = 6*d+7*d-7 // - 6*d+7*d-7
7-(6*d)-(7*d)+97 = 0
7-6*d-7*d+97 = 0
104-13*d = 0 // - 104
-13*d = -104 // : -13
d = -104/(-13)
d = 8
d = 8
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