3 50 | x | + | 7 125 | ( | 40 | − | x | ) | = | 297 125 |
| Left side of the equation = | 3 50 | x | + | 7 125 | × | 40 | − | 7 125 | x |
| = | 3 50 | x | + | 56 25 | − | 7 125 | x |
| = | 1 250 | x | + | 56 25 |
1 250 | x | + | 56 25 | = | 297 125 |
1 250 | x | = | 297 125 | − | 56 25 |
1 250 | x | = | 17 125 |
| x | = | 17 125 | ÷ | 1 250 |
| = | 17 125 | × | 250 |
| = | 17 | × | 2 |
| x | = | 34 |