Question
Answer
$$a-a=0$$
Explanation
| $$ \begin{aligned}a-a& \xlongequal{ } \cancel{a} -\cancel{a} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}0\end{aligned} $$ | |
| ① | Combine like terms: $$ \, \color{blue}{ \cancel{a}} \, \, \color{blue}{ -\cancel{a}} \, = 0 $$ |
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