Question

Решите уравнение:

20/21 − (10/21 + (16/21-x)) =4/21
ДАЮ 35 баллов

Answer 1

$\frac{20}{21} - ( \frac{10}{21} + ( \frac{16}{21} - x)) = \frac{4}{21} \\ \frac{10}{21} + ( \frac{16}{21} - x) = \frac{20}{21} - \frac{4}{21} \\ \frac{10}{21} + ( \frac{16}{21} - x) = \frac{16}{21} \\ \frac{16}{21} - x = \frac{16}{21} - \frac{10}{21} \\ \frac{16}{21} - x = \frac{6}{21} \\ x = \frac{16}{21} - \frac{6}{21} \\ x = \frac{10}{21}$