| 5 | + | ( | x | × | 21 20 | + | 5 | ) | + | 3 20 | x | + | ( | 5 | × | 331 2000 | ) | = | 2719 25 |
| Left side of the equation = | 5 | + | x | × | 21 20 | + | 5 | + | 3 20 | x | + | ( | 5 | × | 331 2000 | ) |
| = | 10 | + | 6 5 | x | + | ( | 5 | × | 331 2000 | ) |
| = | 10 | + | 6 5 | x | + | 5 | × | 331 2000 |
| = | 10 | + | 6 5 | x | + | 331 400 |
| = | 4331 400 | + | 6 5 | x |
4331 400 | + | 6 5 | x | = | 2719 25 |
6 5 | x | = | 2719 25 | − | 4331 400 |
6 5 | x | = | 39173 400 |
| x | = | 39173 400 | ÷ | 6 5 |
| = | 39173 400 | × | 5 6 |
| = | 39173 80 | × | 1 6 |
| x | = | 39173 480 |
| x | = | 81.610417 |