Since both angles lay in the same line, they are supplementary.
This means they add up to 180°
Therefore,
[tex]x-1+2x+1=180[/tex]
Solving for x :
[tex]\begin{gathered} x-1+2x+1=180 \\ \rightarrow3x=180\rightarrow x=\frac{180}{3} \\ \Rightarrow x=60 \end{gathered}[/tex]
We get that x = 60
