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d in (-oo:+oo)
6-3*d = 9/2 // - 9/2
6-3*d-(9/2) = 0
6-3*d-9/2 = 0
3/2-3*d = 0 // - 3/2
-3*d = -3/2 // : -3
d = -3/2/(-3)
d = 1/2
d = 1/2
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