| ( | 42309 1000 | + | x | ) | × | 31 20 | = | 37709 500 | − | x | + | 42309 1000 |
| Left side of the equation = | 42309 1000 | × | 31 20 | + | x | × | 31 20 |
| = | 1311579 20000 | + | x | × | 31 20 |
1311579 20000 | + | 31 20 | x | = | 37709 500 | − | x | + | 42309 1000 |
| Right side of the equation = | 117727 1000 | − | x |
1311579 20000 | + | 31 20 | x | = | 117727 1000 | − | x |
31 20 | x | + | x | = | 117727 1000 | − | 1311579 20000 |
51 20 | x | = | 117727 1000 | − | 1311579 20000 |
51 20 | x | = | 1042961 20000 |
| x | = | 1042961 20000 | ÷ | 51 20 |
| = | 1042961 20000 | × | 20 51 |
| = | 1042961 1000 | × | 1 51 |
| x | = | 1042961 51000 |
| x | = | 20.450216 |