| ( | 145 2 | + | 41 2 | ) | x | + | 145 2 | × | 12 | = | 1800 |
| Left side of the equation = | ( | 145 2 | + | 41 2 | ) | x | + | 870 |
| ( | 145 2 | + | 41 2 | ) | x | + | 870 | = | 1800 |
| Left side of the equation = | 145 2 | x | + | 41 2 | x | + | 870 |
| = | 93 | x | + | 870 |
| 93 | x | + | 870 | = | 1800 |
| 93 | x | = | 1800 | − | 870 |
| 93 | x | = | 930 |
| x | = | 930 | ÷ | 93 |
| = | 930 | × | 1 93 |
| = | 10 | × | 1 |
| x | = | 10 |