Answer
$$5(2r+6)-12r=-2r+30$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}5(2r+6)-12r& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}10r+30-12r \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-2r+30\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{5} $ by $ \left( 2r+6\right) $ $$ \color{blue}{5} \cdot \left( 2r+6\right) = 10r+30 $$ |
| ② | Combine like terms: $$ \color{blue}{10r} +30 \color{blue}{-12r} = \color{blue}{-2r} +30 $$ |
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