Question
Answer
$$(7+2a)\cdot3-20=6a+1$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(7+2a)\cdot3-20& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}21+6a-20 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}6a+1\end{aligned} $$ | |
| ① | $$ \left( \color{blue}{7+2a}\right) \cdot 3 = 21+6a $$ |
| ② | Combine like terms: $$ \color{blue}{21} +6a \color{blue}{-20} = 6a+ \color{blue}{1} $$ |
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