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d in (-oo:+oo)
d-4 = 8-3*d // - 8-3*d
d-(-3*d)-8-4 = 0
d+3*d-8-4 = 0
4*d-12 = 0 // + 12
4*d = 12 // : 4
d = 12/4
d = 3
d = 3
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