Answer
$$a-7a=-6a$$
Explanation
| $$ \begin{aligned}a-7a& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-6a\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{a} \color{blue}{-7a} = \color{blue}{-6a} $$ |
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