| ( | X | × | 1 | + | X | × | 2 | ) | × | 180 | = | 900 |
| Left side of the equation = | X | × | 1 | × | 180 | + | X | × | 2 | × | 180 |
| = | X | × | 180 | + | X | × | 360 |
| = | 540 | X |
| 540 | X | = | 900 |
| X | = | 900 | ÷ | 540 |
| = | 900 | × | 1 540 |
| = | 5 | × | 1 3 |
| X | = | 5 3 |
| X | = | 1.666667 |
| ( | X | × | 1 | − | X | × | 2 | ) | × | 270 | = | 900 |
| Left side of the equation = | X | × | 1 | × | 270 | − | X | × | 2 | × | 270 |
| = | X | × | 270 | − | X | × | 540 |
| = | - | 270 | X |
| - | 270 | X | = | 900 |
| - | 900 | = | 270 | X |
| 270 | X | = | - | 900 |
| X | = | - | 900 | ÷ | 270 |
| = | - | 900 | × | 1 270 |
| = | - | 10 | × | 1 3 |
| X | = | - | 10 3 |
| X | = | - 3.333333 |