Answer
$$c^2d^2-d^2-a^2+cd-9b=c^2d^2-a^2+cd-d^2-9b$$
Explanation
| $$ \begin{aligned}c^2d^2-d^2-a^2+cd-9b& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}c^2d^2-a^2+cd-d^2-9b\end{aligned} $$ | |
| ① | Combine like terms: $$ c^2d^2-d^2-a^2+cd-9b = c^2d^2-a^2+cd-d^2-9b $$ |
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