1) | a | + | 15 | = | 37 | ; |
47 | 47 | 47 |
a | = | 37 | – | 15 | ; |
47 | 47 | 47 |
a | = | 22 | ; |
47 | 47 |
a = 22;
2) | 17 | – | a | = | 5 | ; |
12 | 12 | 12 |
a | = | 17 | – | 5 | ; |
12 | 12 | 12 |
a | = | 12 | ; |
12 | 12 |
а = 12;
3) | 19 | – | a | = 1; |
17 | 17 |
a | = | 19 | – | 17 | ; |
17 | 17 | 17 |
a | = | 2 | ; |
17 | 17 |
a = 2;
4) | a | – | 5 | = 0; |
13 | 13 |
a | = 0 + | 5 | ; |
13 | 13 |
a | = | 5 | ; |
13 | 13 |
a = 5.