| 1 | ÷ | ( | 1 | ÷ | 300 | + | 1 | ÷ | 510 | ) | × | I | − | 3 | = | ( | 1 50 | − | I | ) | × | 8400 | ÷ | 43 |
| 方程两边同时乘以: | ( | 1 | ÷ | 300 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 3 | ( | 1 | ÷ | 300 | + | 1 | ÷ | 510 | ) | = | ( | 1 50 | − | I | ) | × | 8400 | ÷ | 43 | × | ( | 1 | ÷ | 300 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 3 | × | 1 | ÷ | 300 | − | 3 | × | 1 | ÷ | 510 | = | ( | 1 50 | − | I | ) | × | 8400 | ÷ | 43 | × | ( | 1 | ÷ | 300 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 3 | × | 1 | ÷ | 300 | − | 3 | × | 1 | ÷ | 510 | = | 1 50 | × | 8400 | ÷ | 43 | × | ( | 1 | ÷ | 300 | + | 1 | ÷ | 510 | ) | − | I | × | 8400 | ÷ | 43 | × | ( | 1 | ÷ | 300 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 1 100 | − | 1 170 | = | 168 43 | ( | 1 | ÷ | 300 | + | 1 | ÷ | 510 | ) | − | I | × | 8400 43 | ( | 1 | ÷ | 300 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 27 1700 | = | 168 43 | ( | 1 | ÷ | 300 | + | 1 | ÷ | 510 | ) | − | I | × | 8400 43 | ( | 1 | ÷ | 300 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 27 1700 | = | 168 43 | × | 1 | ÷ | 300 | + | 168 43 | × | 1 | ÷ | 510 | − | I | × | 8400 43 | ( | 1 | ÷ | 300 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 27 1700 | = | 14 1075 | + | 28 3655 | − | I | × | 8400 43 | ( | 1 | ÷ | 300 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 27 1700 | = | 378 18275 | − | I | × | 8400 43 | ( | 1 | ÷ | 300 | + | 1 | ÷ | 510 | ) |
| 1 | I | − | 27 1700 | = | 378 18275 | − | I | × | 8400 43 | × | 1 | ÷ | 300 | − | I | × | 8400 43 | × | 1 | ÷ | 510 |
| 1 | I | − | 27 1700 | = | 378 18275 | − | I | × | 28 43 | − | I | × | 280 731 |
| 1 | I | − | 27 1700 | = | 378 18275 | − | 756 731 | I |
| 1 | I | + | 756 731 | I | = | 378 18275 | + | 27 1700 |
1487 731 | I | = | 378 18275 | + | 27 1700 |
1487 731 | I | = | 2673 73100 |
| I | = | 2673 73100 | ÷ | 1487 731 |
| = | 2673 73100 | × | 731 1487 |
| = | 2673 100 | × | 1 1487 |
| I | = | 2673 148700 |
| I | = | 0.017976 |