Answer
$$(4x\cdot5+y\cdot4)\cdot2=40x+8y$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(4x\cdot5+y\cdot4)\cdot2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}(20x+4y)\cdot2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}40x+8y\end{aligned} $$ | |
| ① | $$ 4 x \cdot 5 = 20 x $$ |
| ② | $$ \left( \color{blue}{20x+4y}\right) \cdot 2 = 40x+8y $$ |
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