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d in (-oo:+oo)
7-3*d = 47/8 // - 47/8
7-3*d-(47/8) = 0
7-3*d-47/8 = 0
9/8-3*d = 0 // - 9/8
-3*d = -9/8 // : -3
d = -9/8/(-3)
d = 3/8
d = 3/8
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