Answer
$$5(3n-x)-25=15n-5x-25$$
Explanation
| $$ \begin{aligned}5(3n-x)-25& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}15n-5x-25\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{5} $ by $ \left( 3n-x\right) $ $$ \color{blue}{5} \cdot \left( 3n-x\right) = 15n-5x $$ |
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