| ( | 55500 | × | 12 | − | 7 10 | × | 15 | x | × | 8 125 | ) | ÷ | ( | 3 10 | × | 15 | x | + | 1 20 | × | 13 | x | ) | = | 19 500 |
| 方程两边同时乘以: | ( | 3 10 | × | 15 | x | + | 1 20 | × | 13 | x | ) |
| ( | 55500 | × | 12 | − | 7 10 | × | 15 | x | × | 8 125 | ) | = | 19 500 | ( | 3 10 | × | 15 | x | + | 1 20 | × | 13 | x | ) |
| 55500 | × | 12 | − | 7 10 | × | 15 | x | × | 8 125 | = | 19 500 | ( | 3 10 | × | 15 | x | + | 1 20 | × | 13 | x | ) |
| 55500 | × | 12 | − | 7 10 | × | 15 | x | × | 8 125 | = | 19 500 | × | 3 10 | × | 15 | x | + | 19 500 | × | 1 20 | × | 13 | x |
| 666000 | − | 84 125 | x | = | 171 1000 | x | + | 247 10000 | x |
| 666000 | − | 84 125 | x | = | 1957 10000 | x |
| - | 84 125 | x | − | 1957 10000 | x | = | - | 666000 |
| - | 8677 10000 | x | = | - | 666000 |
| 666000 | = | 8677 10000 | x |
8677 10000 | x | = | 666000 |
| x | = | 666000 | ÷ | 8677 10000 |
| = | 666000 | × | 10000 8677 |
| x | = | 6660000000 8677 |
| x | = | 767546.387 |