| ( | 169 | + | 389 | ) | ÷ | 30 | × | x | + | 193 | ÷ | 30 | × | ( | x | + | 15 | ) | + | 90 | ÷ | 30 | × | ( | x | + | 30 | ) | = | 1145 |
| 方程左边 = | ( | 169 | + | 389 | ) | × | 1 30 | x | + | 193 30 | ( | x | + | 15 | ) | + | 3 | ( | x | + | 30 | ) |
| ( | 169 | + | 389 | ) | × | 1 30 | x | + | 193 30 | ( | x | + | 15 | ) | + | 3 | ( | x | + | 30 | ) | = | 1145 |
| 方程左边 = | 169 | × | 1 30 | x | + | 389 | × | 1 30 | x | + | 193 30 | ( | x | + | 15 | ) | + | 3 | ( | x | + | 30 | ) |
| = | 169 30 | x | + | 389 30 | x | + | 193 30 | ( | x | + | 15 | ) | + | 3 | ( | x | + | 30 | ) |
| = | 93 5 | x | + | 193 30 | ( | x | + | 15 | ) | + | 3 | ( | x | + | 30 | ) |
| = | 93 5 | x | + | 193 30 | x | + | 193 30 | × | 15 | + | 3 | ( | x | + | 30 | ) |
| = | 93 5 | x | + | 193 30 | x | + | 193 2 | + | 3 | ( | x | + | 30 | ) |
| = | 751 30 | x | + | 193 2 | + | 3 | ( | x | + | 30 | ) |
| = | 751 30 | x | + | 193 2 | + | 3 | x | + | 3 | × | 30 |
| = | 751 30 | x | + | 193 2 | + | 3 | x | + | 90 |
| = | 841 30 | x | + | 373 2 |
841 30 | x | + | 373 2 | = | 1145 |
841 30 | x | = | 1145 | − | 373 2 |
841 30 | x | = | 1917 2 |
| x | = | 1917 2 | ÷ | 841 30 |
| = | 1917 2 | × | 30 841 |
| = | 1917 | × | 15 841 |
| x | = | 28755 841 |
| x | = | 34.191439 |