Calculating angle ABD.
Let it be a.
Using cosine rule.
25 = 36+9-2*18cosa
36cosa = 45-25
a = acos(20/36)°
a = acos(5/9)°
Calculating x.
Using cosine rule.
x² = 36+144-2*6*12cos(acos(5/9))
x² = 180-144(5/9)
x² = 180-(5*16)
x² = 100
x = 10 units.
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