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d in (-oo:+oo)
(-1/2)*d+1 = 13/11-d // - 13/11-d
(-1/2)*d+d-(13/11)+1 = 0
(-1/2)*d+d-13/11+1 = 0
1/2*d-2/11 = 0 // + 2/11
1/2*d = 2/11 // : 1/2
d = 2/11/1/2
d = 4/11
d = 4/11
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