| ( | ( | ( | 19 20 | + | 31 20 | ) | × | 19 20 | + | 173 50 | ) | × | 19 20 | + | x | ) | × | 21 20 | = | 1 | + | 173 50 | + | 31 20 | + | x |
| Left side of the equation = | ( | ( | 19 20 | + | 31 20 | ) | × | 19 20 | + | 173 50 | ) | × | 19 20 | × | 21 20 | + | x | × | 21 20 |
| = | ( | ( | 19 20 | + | 31 20 | ) | × | 19 20 | + | 173 50 | ) | × | 399 400 | + | x | × | 21 20 |
| = | ( | 19 20 | + | 31 20 | ) | × | 19 20 | × | 399 400 | + | 173 50 | × | 399 400 | + | 21 20 | x |
| = | ( | 19 20 | + | 31 20 | ) | × | 7581 8000 | + | 69027 20000 | + | 21 20 | x |
| = | 19 20 | × | 7581 8000 | + | 31 20 | × | 7581 8000 | + | 69027 20000 | + | 21 20 | x |
| = | 144039 160000 | + | 235011 160000 | + | 69027 20000 | + | 21 20 | x |
| = | 465633 80000 | + | 21 20 | x |
465633 80000 | + | 21 20 | x | = | 1 | + | 173 50 | + | 31 20 | + | x |
| Right side of the equation = | 601 100 | + | x |
465633 80000 | + | 21 20 | x | = | 601 100 | + | x |
21 20 | x | − | x | = | 601 100 | − | 465633 80000 |
1 20 | x | = | 601 100 | − | 465633 80000 |
1 20 | x | = | 15167 80000 |
| x | = | 15167 80000 | ÷ | 1 20 |
| = | 15167 80000 | × | 20 |
| = | 15167 4000 | × | 1 |
| x | = | 15167 4000 |
| x | = | 3.79175 |