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d in (-oo:+oo)
7*d-8 = 18-6*d // - 18-6*d
7*d-(-6*d)-18-8 = 0
7*d+6*d-18-8 = 0
13*d-26 = 0 // + 26
13*d = 26 // : 13
d = 26/13
d = 2
d = 2
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