Решите: x-(3 целых 13-21ых) + (2 целых 10-21ых) = (7 целых 2-21ых)

Question

Решите: x-(3 целых 13-21ых) + (2 целых 10-21ых) = (7 целых 2-21ых)

Answer 1

X-3 13/21+2 10/21=7 2/21
X-3 13/21= 7 2/21-2 10/21
7 2/21=6 23/21
X-3 13/21=4 13/21
X=3 13/21+4 13/21
X=7 26/21=8 5/21

Answer 2

3 13/21 - 2 10/21 = 1 3/21
7 2/21 + 1 3/21 =8 5/21
Отв: x = 8 5/21