Answer
$$10(6k-1)+10=60k$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}10(6k-1)+10& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}60k-10+10 \xlongequal{ } \\[1 em] & \xlongequal{ }60k -\cancel{10}+ \cancel{10} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}60k\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{10} $ by $ \left( 6k-1\right) $ $$ \color{blue}{10} \cdot \left( 6k-1\right) = 60k-10 $$ |
| ② | Combine like terms: $$ 60k \, \color{blue}{ -\cancel{10}} \,+ \, \color{blue}{ \cancel{10}} \, = 60k $$ |
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