Answer
$$a+5t+1+3(2a-4t+7)=7a-7t+22$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}a+5t+1+3(2a-4t+7)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}a+5t+1+6a-12t+21 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}7a-7t+22\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{3} $ by $ \left( 2a-4t+7\right) $ $$ \color{blue}{3} \cdot \left( 2a-4t+7\right) = 6a-12t+21 $$ |
| ② | Combine like terms: $$ \color{blue}{a} + \color{red}{5t} + \color{green}{1} + \color{blue}{6a} \color{red}{-12t} + \color{green}{21} = \color{blue}{7a} \color{red}{-7t} + \color{green}{22} $$ |
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