| ( | 1350 | − | 42 5 | b | ) | ÷ | ( | b | + | 509 1000 | ) | + | 333 5 | = | 210553 1000 |
| 方程两边同时乘以: | ( | b | + | 509 1000 | ) |
| ( | 1350 | − | 42 5 | b | ) | + | 333 5 | ( | b | + | 509 1000 | ) | = | 210553 1000 | ( | b | + | 509 1000 | ) |
| 1350 | − | 42 5 | b | + | 333 5 | ( | b | + | 509 1000 | ) | = | 210553 1000 | ( | b | + | 509 1000 | ) |
| 1350 | − | 42 5 | b | + | 333 5 | ( | b | + | 509 1000 | ) | = | 210553 1000 | b | + | 210553 1000 | × | 509 1000 |
| 1350 | − | 42 5 | b | + | 333 5 | ( | b | + | 509 1000 | ) | = | 210553 1000 | b | + | 107171477 1000000 |
| 1350 | − | 42 5 | b | + | 333 5 | b | + | 333 5 | × | 509 1000 | = | 210553 1000 | b | + | 107171477 1000000 |
| 1350 | − | 42 5 | b | + | 333 5 | b | + | 169497 5000 | = | 210553 1000 | b | + | 107171477 1000000 |
6919497 5000 | + | 291 5 | b | = | 210553 1000 | b | + | 107171477 1000000 |
291 5 | b | − | 210553 1000 | b | = | 107171477 1000000 | − | 6919497 5000 |
| - | 152353 1000 | b | = | 107171477 1000000 | − | 6919497 5000 |