Explanation
In the question, we can see that x and (x-42) are co-interior angles. Since co-interior angles are supplementary we will have that;
[tex]\begin{gathered} x+x-42=180 \\ 2x=180+42 \\ 2x=222 \\ x=\frac{222}{2}=111 \end{gathered}[/tex]
Answer: x=111
