Question

(5/7-2/3у)*21=1
уравнение))
помогите

Answer 1

$( frac{5}{7}- frac{2}{3}y) *21=1 \ \ frac{5}{7}- frac{2}{3}y= frac{1}{21} \ \ frac{2}{3}y= frac{5}{7}- frac{1}{21} \ \ frac{2}{3}y= frac{15-1}{21} = frac{14}{21} \ \ y= frac{14}{21}* frac{3}{2} \ \ y= frac{7}{7}=1$

Answer 2

(5/7-2у/3)*21=1
5/7-2у/3=1/21
2у/3=5/7-1/21=15/21-1/21=14/21=2/3
у=2/3:2/3=1