notice that angle 3 and angle 7 are corresponding angles, then:
[tex]\measuredangle3=115=\measuredangle7[/tex]then, angle 7 is vertical with angle 5, therefore:
[tex]\begin{gathered} \measuredangle7=\measuredangle5 \\ \Rightarrow\measuredangle5=115\degree \end{gathered}[/tex]finally, we have that angle 5 measures 115 degrees
