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d in (-oo:+oo)
d-(4*d)-1 = -13 // + 13
d-(4*d)-1+13 = 0
d-4*d-1+13 = 0
12-3*d = 0 // - 12
-3*d = -12 // : -3
d = -12/(-3)
d = 4
d = 4
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