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d in (-oo:+oo)
d/2-d+5/4 = 9/4 // - 9/4
d/2-d+5/4-(9/4) = 0
d/2-d+5/4-9/4 = 0
-1/2*d-1 = 0 // + 1
-1/2*d = 1 // : -1/2
d = 1/(-1/2)
d = -2
d = -2
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