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d in (-oo:+oo)
(1/2)*d+2 = 9/2 // - 9/2
(1/2)*d-(9/2)+2 = 0
(1/2)*d-9/2+2 = 0
1/2*d-5/2 = 0 // + 5/2
1/2*d = 5/2 // : 1/2
d = 5/2/1/2
d = 5
d = 5
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