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