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d in (-oo:+oo)
5-(2*d) = 13-6*d // - 13-6*d
5-(2*d)-(-6*d)-13 = 0
6*d-2*d-13+5 = 0
4*d-8 = 0 // + 8
4*d = 8 // : 4
d = 8/4
d = 2
d = 2
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