Answer:
4 is the answer to this problem
[tex]2x + (13x - 15) = 180[/tex] (Linear pair postulate)
Open the brackets and you get:
[tex]2x + 13x -15 = 180[/tex]
[tex]15x - 15 = 180[/tex]
[tex]15x = 180 + 15[/tex]
[tex]15x = 195[/tex]
[tex]x = \frac{195}{15}[/tex]
[tex]x = 13[/tex]
