Question

Помогите пожалуйста =(​

Answer 1

Пошаговое объяснение:

$(x - 3 \frac{13}{21} ) + 2 \frac{10}{21} = 7 \frac{2}{21} \\ (x - \frac{76}{21} ) + \frac{52}{21} = \frac{149}{21} \\ x - \frac{76}{21} + \frac{52}{21} = \frac{149}{21} \\ x - \frac{8}{7} = \frac{149}{21} \\ x = \frac{149}{21} + \frac{8}{7} \\ x = \frac{173}{21} = 8 \frac{5}{21}$