Hi Mr or Ms could you help me with this problem because I'm getting thrown off. it would be really awesome if you could help me out step by step here because I'm a bit stuck

According to the given graph, the given angles are alternate interior angles that are always equivalent.
Having said that, we can express the following equation.-
[tex]7x-1=125[/tex]Solving for x, we have
[tex]\begin{gathered} 7x=125+1 \\ 7x=126 \\ \frac{7x}{7}=\frac{126}{7} \\ x=18 \end{gathered}[/tex]