Respuesta :

∠a and ∠b are vertical angles, therefore:

[tex]\begin{gathered} \angle a=\angle b \\ \angle b=103 \end{gathered}[/tex]

[tex]\begin{gathered} 108=x-40 \\ \text{solve for x:} \\ x=108+40 \\ x=148 \end{gathered}[/tex]

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