Explanation
In the image the triangles are congruent, therefore
[tex]\begin{gathered} \angle DAC\cong\angle\text{CAB} \\ 5x=3x+12 \\ 5x-3x=12 \\ 2x=6 \\ x=\frac{6}{2} \\ x=3 \end{gathered}[/tex]
Answer 1 : x =3
Also,
[tex]\begin{gathered} \angle DAB=\angle DAC+\angle\text{CAB} \\ \angle DAB=5x+3x+12 \\ \angle DAB=8x+12 \\ \angle DAB=8(3)+12 \\ \angle DAB=24+12 \\ \angle DAB=36^0 \end{gathered}[/tex]
Answer 2: 36 degrees
