| $$ \begin{aligned}17.32-9.8t& \xlongequal{ }17.32-9t \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-9t+17\end{aligned} $$ | |
| ① | Combine like terms: $$ -9t+17 = -9t+17 $$ |