| 1 | ÷ | ( | 1 | ÷ | 100 | + | 1 | ÷ | 510 | ) | × | I | − | 3 | = | ( | 1 5 | − | I | ) | × | 8400 | ÷ | 43 |
| 方程两边同时乘以: | ( | 1 | ÷ | 100 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 3 | ( | 1 | ÷ | 100 | + | 1 | ÷ | 510 | ) | = | ( | 1 5 | − | I | ) | × | 8400 | ÷ | 43 | × | ( | 1 | ÷ | 100 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 3 | × | 1 | ÷ | 100 | − | 3 | × | 1 | ÷ | 510 | = | ( | 1 5 | − | I | ) | × | 8400 | ÷ | 43 | × | ( | 1 | ÷ | 100 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 3 | × | 1 | ÷ | 100 | − | 3 | × | 1 | ÷ | 510 | = | 1 5 | × | 8400 | ÷ | 43 | × | ( | 1 | ÷ | 100 | + | 1 | ÷ | 510 | ) | − | I | × | 8400 | ÷ | 43 | × | ( | 1 | ÷ | 100 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 3 100 | − | 1 170 | = | 1680 43 | ( | 1 | ÷ | 100 | + | 1 | ÷ | 510 | ) | − | I | × | 8400 43 | ( | 1 | ÷ | 100 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 61 1700 | = | 1680 43 | ( | 1 | ÷ | 100 | + | 1 | ÷ | 510 | ) | − | I | × | 8400 43 | ( | 1 | ÷ | 100 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 61 1700 | = | 1680 43 | × | 1 | ÷ | 100 | + | 1680 43 | × | 1 | ÷ | 510 | − | I | × | 8400 43 | ( | 1 | ÷ | 100 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 61 1700 | = | 84 215 | + | 56 731 | − | I | × | 8400 43 | ( | 1 | ÷ | 100 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 61 1700 | = | 1708 3655 | − | I | × | 8400 43 | ( | 1 | ÷ | 100 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 61 1700 | = | 1708 3655 | − | I | × | 8400 43 | × | 1 | ÷ | 100 | − | I | × | 8400 43 | × | 1 | ÷ | 510 |
| 1 | I | − | 61 1700 | = | 1708 3655 | − | I | × | 84 43 | − | I | × | 280 731 |
| 1 | I | − | 61 1700 | = | 1708 3655 | − | 1708 731 | I |
| 1 | I | + | 1708 731 | I | = | 1708 3655 | + | 61 1700 |
2439 731 | I | = | 1708 3655 | + | 61 1700 |
2439 731 | I | = | 36783 73100 |
| I | = | 36783 73100 | ÷ | 2439 731 |
| = | 36783 73100 | × | 731 2439 |
| = | 4087 100 | × | 1 271 |
| I | = | 4087 27100 |
| I | = | 0.150812 |