131 10 | x | = | ( | x | + | 16 5 | ) | × | 399 50 |
| Right side of the equation = | x | × | 399 50 | + | 16 5 | × | 399 50 |
| = | x | × | 399 50 | + | 3192 125 |
131 10 | x | = | 399 50 | x | + | 3192 125 |
131 10 | x | − | 399 50 | x | = | 3192 125 |
128 25 | x | = | 3192 125 |
| x | = | 3192 125 | ÷ | 128 25 |
| = | 3192 125 | × | 25 128 |
| = | 399 5 | × | 1 16 |
| x | = | 399 80 |
| x | = | 4.9875 |