The given pair of lines is

$135x^2-136xy+33y^2=0 ..... ( \mathrm{i} )$

The equation of bisectors of angles between the

 $$\begin{gathered} pair of lines of \left(i\right) is\frac{x^2-y^2}{a-b}=\frac{xy}{h} \\ \Rightarrow 2x^2+3xy-2y^2=0 \\ \Rightarrow (x+2y)(2x-y)=0 \end{gathered}$$ 

One of the bisectors is $x+2y=0$ which is parallel to the line $x+2y=7$ 

Hence, the line $x+2y=7$ is equally inclined to the given lines.