| ( | 1 500 | + | 1 1250 | x | ) | ÷ | 7 5000 | + | ( | 1 500 | + | 1 1250 | x | ) | ÷ | 9 10000 | + | x | = | 400 |
| 方程左边 = | 1 500 | × | 5000 7 | + | 1 1250 | x | × | 5000 7 | + | ( | 1 500 | + | 1 1250 | x | ) | × | 10000 9 | + | x |
| = | 10 7 | + | 4 7 | x | + | ( | 1 500 | + | 1 1250 | x | ) | × | 10000 9 | + | x |
| = | 10 7 | + | 11 7 | x | + | ( | 1 500 | + | 1 1250 | x | ) | × | 10000 9 |
| = | 10 7 | + | 11 7 | x | + | 1 500 | × | 10000 9 | + | 1 1250 | x | × | 10000 9 |
| = | 10 7 | + | 11 7 | x | + | 20 9 | + | 8 9 | x |
| = | 230 63 | + | 155 63 | x |
230 63 | + | 155 63 | x | = | 400 |
155 63 | x | = | 400 | − | 230 63 |
155 63 | x | = | 24970 63 |
| x | = | 24970 63 | ÷ | 155 63 |
| = | 24970 63 | × | 63 155 |
| = | 4994 | × | 1 31 |
| x | = | 4994 31 |
| x | = | 161.096774 |