Answer
$$4\cdot(1-9)-7k=-7k-32$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}4\cdot(1-9)-7k& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4\cdot(-8)-7k \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-32-7k \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}-7k-32\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{1} \color{blue}{-9} = \color{blue}{-8} $$ |
| ② | $$ 4 \cdot -8 = -32 $$ |
| ③ | Combine like terms: $$ -7k-32 = -7k-32 $$ |
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