27)
[tex]\begin{gathered} 6x+13+7x-2=180 \\ 13x+11=180 \\ 13x=180-11 \\ 13x=169 \\ x=\frac{169}{13} \\ x=13 \end{gathered}[/tex][tex]\begin{gathered} m\angle ABC=7x-2 \\ m\angle ABC=7(13)-2 \\ m\angle ABC=91-2 \\ m\angle ABC=89^0 \end{gathered}[/tex]
