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d in (-oo:+oo)
4*d-9 = 71-4*d // - 71-4*d
4*d-(-4*d)-71-9 = 0
4*d+4*d-71-9 = 0
8*d-80 = 0 // + 80
8*d = 80 // : 8
d = 80/8
d = 10
d = 10
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