| ( | 199 | + | 240 | ) | ÷ | 30 | × | x | + | 226 | ÷ | 30 | × | ( | x | + | 15 | ) | + | 120 | ÷ | 30 | × | ( | x | + | 30 | ) | = | 1593 |
| 方程左边 = | ( | 199 | + | 240 | ) | × | 1 30 | x | + | 113 15 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) |
| ( | 199 | + | 240 | ) | × | 1 30 | x | + | 113 15 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) | = | 1593 |
| 方程左边 = | 199 | × | 1 30 | x | + | 240 | × | 1 30 | x | + | 113 15 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) |
| = | 199 30 | x | + | 8 | x | + | 113 15 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) |
| = | 439 30 | x | + | 113 15 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) |
| = | 439 30 | x | + | 113 15 | x | + | 113 15 | × | 15 | + | 4 | ( | x | + | 30 | ) |
| = | 439 30 | x | + | 113 15 | x | + | 113 | + | 4 | ( | x | + | 30 | ) |
| = | 133 6 | x | + | 113 | + | 4 | ( | x | + | 30 | ) |
| = | 133 6 | x | + | 113 | + | 4 | x | + | 4 | × | 30 |
| = | 133 6 | x | + | 113 | + | 4 | x | + | 120 |
| = | 157 6 | x | + | 233 |
157 6 | x | + | 233 | = | 1593 |
157 6 | x | = | 1593 | − | 233 |
157 6 | x | = | 1360 |
| x | = | 1360 | ÷ | 157 6 |
| = | 1360 | × | 6 157 |
| x | = | 8160 157 |
| x | = | 51.974522 |