| ( | 42 | − | 3761 100 | ) | ÷ | ( | 42 | − | 35 | ) | = | ( | 49 50 | − | x | ) | ÷ | ( | 49 50 | − | 19 20 | ) |
| 方程两边同时乘以: | ( | 42 | − | 35 | ) | , | ( | 49 50 | − | 19 20 | ) |
| ( | 42 | − | 3761 100 | ) | ( | 49 50 | − | 19 20 | ) | = | ( | 49 50 | − | x | ) | ( | 42 | − | 35 | ) |
| 42 | ( | 49 50 | − | 19 20 | ) | − | 3761 100 | ( | 49 50 | − | 19 20 | ) | = | ( | 49 50 | − | x | ) | ( | 42 | − | 35 | ) |
| 42 | ( | 49 50 | − | 19 20 | ) | − | 3761 100 | ( | 49 50 | − | 19 20 | ) | = | 49 50 | ( | 42 | − | 35 | ) | − | x | ( | 42 | − | 35 | ) |
| 42 | × | 49 50 | − | 42 | × | 19 20 | − | 3761 100 | ( | 49 50 | − | 19 20 | ) | = | 49 50 | ( | 42 | − | 35 | ) | − | x | ( | 42 | − | 35 | ) |
| 42 | × | 49 50 | − | 42 | × | 19 20 | − | 3761 100 | ( | 49 50 | − | 19 20 | ) | = | 49 50 | × | 42 | − | 49 50 | × | 35 | − | x | ( | 42 | − | 35 | ) |
1029 25 | − | 399 10 | − | 3761 100 | ( | 49 50 | − | 19 20 | ) | = | 1029 25 | − | 343 10 | − | x | ( | 42 | − | 35 | ) |
63 50 | − | 3761 100 | ( | 49 50 | − | 19 20 | ) | = | 343 50 | − | x | ( | 42 | − | 35 | ) |
63 50 | − | 3761 100 | × | 49 50 | + | 3761 100 | × | 19 20 | = | 343 50 | − | x | ( | 42 | − | 35 | ) |
63 50 | − | 3761 100 | × | 49 50 | + | 3761 100 | × | 19 20 | = | 343 50 | − | x | × | 42 | + | x | × | 35 |
63 50 | − | 184289 5000 | + | 71459 2000 | = | 343 50 | − | x | × | 42 | + | x | × | 35 |
1317 10000 | = | 343 50 | − | 7 | x |
| 7 | x | = | 343 50 | − | 1317 10000 |
| 7 | x | = | 67283 10000 |
| x | = | 67283 10000 | ÷ | 7 |
| = | 67283 10000 | × | 1 7 |
| x | = | 67283 70000 |
| x | = | 0.961186 |