Answer:
12
Explanation:
Since the triangles are similar (and it's clear which sides are correlated to which), we can tell than CB/SB = DB/TB
CB=SB+CS=24+18=42
42/24=(9+TB)/TB
42*TB=24*(9+TB)
42*TB = 24*9+24*TB
18*TB=24*9
24*9/18=TB=12
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