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d in (-oo:+oo)
-13 = 8-6*d-d // - 8-6*d-d
d-(-6*d)-13-8 = 0
6*d+d-13-8 = 0
7*d-21 = 0 // + 21
7*d = 21 // : 7
d = 21/7
d = 3
d = 3
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