| 13 | + | ( | x | × | 51 50 | + | 5 2 | ) | + | 3 20 | x | + | ( | 13 | × | 331 2000 | ) | = | 164 |
| Left side of the equation = | 13 | + | x | × | 51 50 | + | 5 2 | + | 3 20 | x | + | ( | 13 | × | 331 2000 | ) |
| = | 31 2 | + | 117 100 | x | + | ( | 13 | × | 331 2000 | ) |
| = | 31 2 | + | 117 100 | x | + | 13 | × | 331 2000 |
| = | 31 2 | + | 117 100 | x | + | 4303 2000 |
| = | 35303 2000 | + | 117 100 | x |
35303 2000 | + | 117 100 | x | = | 164 |
117 100 | x | = | 164 | − | 35303 2000 |
117 100 | x | = | 292697 2000 |
| x | = | 292697 2000 | ÷ | 117 100 |
| = | 292697 2000 | × | 100 117 |
| = | 292697 20 | × | 1 117 |
| x | = | 292697 2340 |
| x | = | 125.084188 |