| 142 | = | ( | X | ÷ | ( | 20 | × | 157 50 | ) | ) | ( | 40 | × | 157 50 | ) | + | X |
| 142 | = | X | ÷ | ( | 20 | × | 157 50 | ) | × | ( | 40 | × | 157 50 | ) | + | X |
| 方程两边同时乘以: | ( | 20 | × | 157 50 | ) |
| 142 | ( | 20 | × | 157 50 | ) | = | X | ( | 40 | × | 157 50 | ) | + | X | ( | 20 | × | 157 50 | ) |
| 142 | × | 20 | × | 157 50 | = | X | ( | 40 | × | 157 50 | ) | + | X | ( | 20 | × | 157 50 | ) |
| 142 | × | 20 | × | 157 50 | = | X | × | 40 | × | 157 50 | + | X | ( | 20 | × | 157 50 | ) |
44588 5 | = | X | × | 628 5 | + | X | ( | 20 | × | 157 50 | ) |
44588 5 | = | 628 5 | X | + | X | × | 20 | × | 157 50 |
44588 5 | = | 628 5 | X | + | X | × | 314 5 |
44588 5 | = | 942 5 | X |
| - | 942 5 | X | = | - | 44588 5 |
44588 5 | = | 942 5 | X |
942 5 | X | = | 44588 5 |
| X | = | 44588 5 | ÷ | 942 5 |
| = | 44588 5 | × | 5 942 |
| = | 22294 | × | 1 471 |
| X | = | 22294 471 |
| X | = | 142 3 |
| X | = | 47.333333 |