Answer
$$1.1p(est+st+et+t+es+s+e+1)=epst+eps+ept+pst+ep+ps+pt+p$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}1.1p(est+st+et+t+es+s+e+1)& \xlongequal{ }p(est+st+et+t+es+s+e+1) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}epst+eps+ept+pst+ep+ps+pt+p\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{p} $ by $ \left( est+st+et+t+es+s+e+1\right) $ $$ \color{blue}{p} \cdot \left( est+st+et+t+es+s+e+1\right) = epst+pst+ept+pt+eps+ps+ep+p $$ |
| ② | Combine like terms: $$ epst+pst+ept+pt+eps+ps+ep+p = epst+eps+ept+pst+ep+ps+pt+p $$ |
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