If f and g are parallel, we can say that
Now we know all the angles, we say that
[tex]3x+7x+20=180\degree[/tex]
Because:
Therefore we just have to solve it for x now
[tex]\begin{gathered} 3x+7x+20=180 \\ \\ 10x=180-20 \\ \\ x=\frac{160}{10} \\ \\ x=16 \end{gathered}[/tex]
Hence, the value of x is 16
