Решите уровнение (3 1/8 + 1 3/4) х = 2 1/6

(3 1/8 + 1 3/4) х = 2 1/6

(25/8+7/4)х=13/6

(25/8+14/8)х=13/6

39/8х=13/6

х=13/6 : 39/8

х=13/6* 8/39

х=1/3*4/3

х=4/9

проверка

39/8 * 4/9= 13/6

156/72=13/6

2 12/72=13/6

2 1/6= 2  1/6

3 1/8x + 1 3/4x = 2 1/6

3 1/8x + 1 6/8x = 2 1/6

4 7/8x = 2 1/6 | : 4 7/8

x = 4/9