| ( | 5 | ( | 1223 | + | x | ) | + | ( | 2 | × | 48 | ) | + | ( | 3 | × | 135 | ) | + | ( | 4 | × | 204 | ) | + | ( | 1 | × | 87 | ) | ) | ÷ | ( | 1697 | + | x | ) | = | 91 20 |
| Multiply both sides of the equation by: | ( | 1697 | + | x | ) |
| ( | 5 | ( | 1223 | + | x | ) | + | ( | 2 | × | 48 | ) | + | ( | 3 | × | 135 | ) | + | ( | 4 | × | 204 | ) | + | ( | 1 | × | 87 | ) | ) | = | 91 20 | ( | 1697 | + | x | ) |
| 5 | ( | 1223 | + | x | ) | + | ( | 2 | × | 48 | ) | + | ( | 3 | × | 135 | ) | + | ( | 4 | × | 204 | ) | + | ( | 1 | × | 87 | ) | = | 91 20 | ( | 1697 | + | x | ) |
| 5 | ( | 1223 | + | x | ) | + | ( | 2 | × | 48 | ) | + | ( | 3 | × | 135 | ) | + | ( | 4 | × | 204 | ) | + | ( | 1 | × | 87 | ) | = | 91 20 | × | 1697 | + | 91 20 | x |
| 5 | ( | 1223 | + | x | ) | + | ( | 2 | × | 48 | ) | + | ( | 3 | × | 135 | ) | + | ( | 4 | × | 204 | ) | + | ( | 1 | × | 87 | ) | = | 154427 20 | + | 91 20 | x |
| 5 | × | 1223 | + | 5 | x | + | ( | 2 | × | 48 | ) | + | ( | 3 | × | 135 | ) | + | ( | 4 | × | 204 | ) | + | ( | 1 | × | 87 | ) | = | 154427 20 | + | 91 20 | x |
| 6115 | + | 5 | x | + | ( | 2 | × | 48 | ) | + | ( | 3 | × | 135 | ) | + | ( | 4 | × | 204 | ) | + | ( | 1 | × | 87 | ) | = | 154427 20 | + | 91 20 | x |
| 6115 | + | 5 | x | + | 2 | × | 48 | + | ( | 3 | × | 135 | ) | + | ( | 4 | × | 204 | ) | + | ( | 1 | × | 87 | ) | = | 154427 20 | + | 91 20 | x |
| 6115 | + | 5 | x | + | 96 | + | ( | 3 | × | 135 | ) | + | ( | 4 | × | 204 | ) | + | ( | 1 | × | 87 | ) | = | 154427 20 | + | 91 20 | x |
| 6211 | + | 5 | x | + | ( | 3 | × | 135 | ) | + | ( | 4 | × | 204 | ) | + | ( | 1 | × | 87 | ) | = | 154427 20 | + | 91 20 | x |
| 6211 | + | 5 | x | + | 3 | × | 135 | + | ( | 4 | × | 204 | ) | + | ( | 1 | × | 87 | ) | = | 154427 20 | + | 91 20 | x |
| 6211 | + | 5 | x | + | 405 | + | ( | 4 | × | 204 | ) | + | ( | 1 | × | 87 | ) | = | 154427 20 | + | 91 20 | x |
| 6616 | + | 5 | x | + | ( | 4 | × | 204 | ) | + | ( | 1 | × | 87 | ) | = | 154427 20 | + | 91 20 | x |
| 6616 | + | 5 | x | + | 4 | × | 204 | + | ( | 1 | × | 87 | ) | = | 154427 20 | + | 91 20 | x |
| 6616 | + | 5 | x | + | 816 | + | ( | 1 | × | 87 | ) | = | 154427 20 | + | 91 20 | x |
| 7432 | + | 5 | x | + | ( | 1 | × | 87 | ) | = | 154427 20 | + | 91 20 | x |
| 7432 | + | 5 | x | + | 1 | × | 87 | = | 154427 20 | + | 91 20 | x |
| 7432 | + | 5 | x | + | 87 | = | 154427 20 | + | 91 20 | x |
| 7519 | + | 5 | x | = | 154427 20 | + | 91 20 | x |
| 5 | x | − | 91 20 | x | = | 154427 20 | − | 7519 |
9 20 | x | = | 154427 20 | − | 7519 |
9 20 | x | = | 4047 20 |
| x | = | 4047 20 | ÷ | 9 20 |
| = | 4047 20 | × | 20 9 |
| = | 1349 | × | 1 3 |
| x | = | 1349 3 |
| x | = | 449.666667 |