3. Решите уравнение: а) x + 3,12 = -5,43; б) 1 3/14 - y = 2 10/7.

а) x + 3,12 = -5,43
x = -5,43 - 3,12
x = -8,55
б) 1 3/14 - y = 2 10/7
1 3/14 - y = 2 + 10/7
1 3/14 - y = 2 + 1 3/7
1 3/14 - y = 3 3/7
17/14 - y = 24/7
-y = 24/7 - 17/14
-y = (48 - 17) / 14
-y = 31/14
y = -31/14 = -2 3/14