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d in (-oo:+oo)
d/2 = 16/81 // - 16/81
d/2-(16/81) = 0
d/2-16/81 = 0
1/2*d-16/81 = 0 // + 16/81
1/2*d = 16/81 // : 1/2
d = 16/81/1/2
d = 32/81
d = 32/81
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