Answer
$$9x^2+4-169y^2-12x=9x^2-169y^2-12x+4$$
Explanation
| $$ \begin{aligned}9x^2+4-169y^2-12x& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}9x^2-169y^2-12x+4\end{aligned} $$ | |
| ① | Combine like terms: $$ 9x^2-169y^2-12x+4 = 9x^2-169y^2-12x+4 $$ |
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