Question

Помогите. Срочно!!! Помогите с уровнением. ​

Answer 1

$\displaystyle \tt \frac{640}{700}-\bigg(x+\frac{260}{700}\bigg)=\frac{50}{700}\\\\ \displaystyle \tt \frac{640}{700}-x-\frac{260}{700}=\frac{50}{700}\\\\\displaystyle \tt -x+\frac{380}{700}=\frac{50}{700}\\\\ \displaystyle \tt \frac{380}{700}-\frac{50}{700}=x\\\\ \displaystyle \tt \frac{330}{700}=x\\\\ \displaystyle \tt \bold{x=\frac{33}{70}}$