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d in (-oo:+oo)
d-((1/2)*d)+1 = 5/2 // - 5/2
d-((1/2)*d)-(5/2)+1 = 0
d+(-1/2)*d-5/2+1 = 0
1/2*d-3/2 = 0 // + 3/2
1/2*d = 3/2 // : 1/2
d = 3/2/1/2
d = 3
d = 3
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