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d in (-oo:+oo)
-71/3 = 1/3-2*d-d // - 1/3-2*d-d
d-(-2*d)-71/3-(1/3) = 0
2*d+d-71/3-1/3 = 0
3*d-24 = 0 // + 24
3*d = 24 // : 3
d = 24/3
d = 8
d = 8
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