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d in (-oo:+oo)
7-3*d = 9/2 // - 9/2
7-3*d-(9/2) = 0
7-3*d-9/2 = 0
5/2-3*d = 0 // - 5/2
-3*d = -5/2 // : -3
d = -5/2/(-3)
d = 5/6
d = 5/6
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