Question

Х минус 3/21 равно 11/21 помогите пожалуйста

Answer 1

$\displaystyle x-\frac{3}{21}=\frac{11}{21}\\\\ x-\frac{1}{7}=\frac{11}{21}\\\\ x=\frac{11}{21}+\frac{1}{7}\\\\ x=\frac{2}{3}$

Answer 2

$x - \frac{3}{21} = \frac{11}{21} \\ x = \frac{11}{21} + \frac{3}{21} \\ x = \frac{14}{21} = \frac{2}{3}$