| ( | x | − | 200 | ) | × | 145 | × | 145 | ÷ | ( | x | × | 200 | ) | = | 35607 500 |
| 方程两边同时乘以: | ( | x | × | 200 | ) |
| ( | x | − | 200 | ) | × | 145 | × | 145 | = | 35607 500 | ( | x | × | 200 | ) |
| x | × | 145 | × | 145 | − | 200 | × | 145 | × | 145 | = | 35607 500 | ( | x | × | 200 | ) |
| x | × | 145 | × | 145 | − | 200 | × | 145 | × | 145 | = | 35607 500 | x | × | 200 |
| x | × | 21025 | − | 4205000 | = | 71214 5 | x |
| 21025 | x | − | 71214 5 | x | = | 4205000 |
33911 5 | x | = | 4205000 |
| x | = | 4205000 | ÷ | 33911 5 |
| = | 4205000 | × | 5 33911 |
| x | = | 21025000 33911 |
| x | = | 620.005308 |