| 1133 | − | ( | 1133 | × | 40 | ÷ | 300 | ) | − | 100 | − | 120 | ( | 1133 | ÷ | 1200 | ) | = | x |
| 方程左边 = | 1033 | − | ( | 1133 | × | 40 | ÷ | 300 | ) | − | 120 | ( | 1133 | ÷ | 1200 | ) |
| 1033 | − | ( | 1133 | × | 40 | ÷ | 300 | ) | − | 120 | ( | 1133 | ÷ | 1200 | ) | = | x |
| 方程左边 = | 1033 | − | 1133 | × | 40 | ÷ | 300 | − | 120 | ( | 1133 | ÷ | 1200 | ) |
| = | 1033 | − | 2266 15 | − | 120 | ( | 1133 | ÷ | 1200 | ) |
| = | 13229 15 | − | 120 | ( | 1133 | ÷ | 1200 | ) |
| = | 13229 15 | − | 120 | × | 1133 | ÷ | 1200 |
| = | 13229 15 | − | 1133 10 |
| = | 23059 30 |
23059 30 | = | x |
| - | x | = | - | 23059 30 |
23059 30 | = | x |
| x | = | 23059 30 |