| ( | x | − | 90859 10 | ) | × | 1 10 | − | 2520 | = | 1080 | + | ( | ( | x | ÷ | 12 | − | 3000 | ) | × | 1 10 | − | 210 | ) | × | 12 |
| 方程左边 = | x | × | 1 10 | − | 90859 10 | × | 1 10 | − | 2520 |
| = | x | × | 1 10 | − | 90859 100 | − | 2520 |
| = | 1 10 | x | − | 342859 100 |
1 10 | x | − | 342859 100 | = | 1080 | + | ( | ( | x | ÷ | 12 | − | 3000 | ) | × | 1 10 | − | 210 | ) | × | 12 |
| 方程右边 = | 1080 | + | ( | x | ÷ | 12 | − | 3000 | ) | × | 1 10 | × | 12 | − | 210 | × | 12 |
| = | 1080 | + | ( | x | ÷ | 12 | − | 3000 | ) | × | 6 5 | − | 2520 |
| = | - | 1440 | + | ( | x | ÷ | 12 | − | 3000 | ) | × | 6 5 |
| = | - | 1440 | + | x | ÷ | 12 | × | 6 5 | − | 3000 | × | 6 5 |
| = | - | 1440 | + | x | × | 1 10 | − | 3600 |
| = | - | 5040 | + | 1 10 | x |
1 10 | x | − | 342859 100 | = | - | 5040 | + | 1 10 | x |
1 10 | x | − | 1 10 | x | = | - | 5040 | + | 342859 100 |
| 0 | x | = | - | 5040 | + | 342859 100 |
| 0 | x | = | - | 161141 100 |