Решите уравнение ( тута дроби ) 2/21 + z = 5/28 14/25 - t = 8/75 заранее !

2/21 + z = 5/28
z = 5/28 - 2/21
z = (21*5)/588 - (28*2)/588
 z = 105/588 - 56/588
z = 49/588 = 7/84 = 1/12
z = 1/12

14/25  - t = 8/75
t = 14/25 - 8/75
t = 42/75 - 8/75
t = 34/75

2/21+z=5/28
z=5/28-2/21
z=105/588-56/588
z=49/588
z=1/12
ответ: 1/12

14/25-t=8/75
-t=8/75-14/25
-t=8/75-42/75
-t=-34/75
t=34/75
ответ: 34/75