Ответ:

1) x + 14 = 61

x = 61 − 14 = 47.

2) x − 54 = 19

x = 19 + 54 = 73.

3) 27 : y = 9

y = 27 : 9 = 3.

4) x : 3 = 27

x = 27 · 3 = 81.

Ответ: x = 47; x = 73; y = 3; x = 81.