The degree of x in the numerator is 1 and the degree of x in the denominator is 1 as well
There we go ahead to divide the coefficient of x in the numerator by that in the denominator
The coefficient of x in the numerator is 2 and the coefficient of x in the denominator is -1
Therefore
[tex]\begin{gathered} \frac{2}{-1} \\ =-2 \end{gathered}[/tex]The horizontal asymptote is -2