19 20 | × | 48 | × | 1000 | x | = | 1131 | × | 360 | + | 9 20 | × | 470 | × | 1000 | ( | 100 | − | x | ) |
| Left side of the equation = | 45600 | x |
| 45600 | x | = | 1131 | × | 360 | + | 9 20 | × | 470 | × | 1000 | ( | 100 | − | x | ) |
| Right side of the equation = | 407160 | + | 211500 | ( | 100 | − | x | ) |
| 45600 | x | = | 407160 | + | 211500 | ( | 100 | − | x | ) |
| Right side of the equation = | 407160 | + | 211500 | × | 100 | − | 211500 | x |
| = | 407160 | + | 21150000 | − | 211500 | x |
| = | 21557160 | − | 211500 | x |
| 45600 | x | = | 21557160 | − | 211500 | x |
| 45600 | x | + | 211500 | x | = | 21557160 |
| 257100 | x | = | 21557160 |
| x | = | 21557160 | ÷ | 257100 |
| = | 21557160 | × | 1 257100 |
| = | 359286 | × | 1 4285 |
| x | = | 359286 4285 |
| x | = | 83.847375 |