| 435 | ( | 1 | − | ( | 1 | + | r | ) | − | 4 | ) | ÷ | r | = | 816293 100 |
| 方程两边同时乘以: | r |
| 435 | ( | 1 | − | ( | 1 | + | r | ) | − | 4 | ) | = | 816293 100 | r |
| 435 | × | 1 | − | 435 | ( | 1 | + | r | ) | − | 435 | × | 4 | = | 816293 100 | r |
| 435 | − | 435 | ( | 1 | + | r | ) | − | 1740 | = | 816293 100 | r |
| - | 1305 | − | 435 | ( | 1 | + | r | ) | = | 816293 100 | r |
| - | 1305 | − | 435 | × | 1 | − | 435 | r | = | 816293 100 | r |
| - | 1305 | − | 435 | − | 435 | r | = | 816293 100 | r |
| - | 1740 | − | 435 | r | = | 816293 100 | r |
| - | 435 | r | − | 816293 100 | r | = | 1740 |
| - | 859793 100 | r | = | 1740 |
| - | 1740 | = | 859793 100 | r |
859793 100 | r | = | - | 1740 |
| r | = | - | 1740 | ÷ | 859793 100 |
| = | - | 1740 | × | 100 859793 |
| r | = | - | 174000 859793 |
| r | = | - 0.202374 |