| ( | 4 | − | 4 5 | ) | ÷ | ( | 4 | − | 3 25 | ) | × | ( | 39331 | − | X | ) | × | 3 20 | ÷ | 2 | + | 1 5 | X | = | 398363 100 |
| 方程两边同时乘以: | ( | 4 | − | 3 25 | ) |
| ( | 4 | − | 4 5 | ) | ( | 39331 | − | X | ) | × | 3 20 | ÷ | 2 | + | 1 5 | X | ( | 4 | − | 3 25 | ) | = | 398363 100 | ( | 4 | − | 3 25 | ) |
| 4 | ( | 39331 | − | X | ) | × | 3 20 | ÷ | 2 | − | 4 5 | ( | 39331 | − | X | ) | × | 3 20 | ÷ | 2 | + | 1 5 | X | ( | 4 | − | 3 25 | ) | = | 398363 100 | ( | 4 | − | 3 25 | ) |
| 4 | ( | 39331 | − | X | ) | × | 3 20 | ÷ | 2 | − | 4 5 | ( | 39331 | − | X | ) | × | 3 20 | ÷ | 2 | + | 1 5 | X | ( | 4 | − | 3 25 | ) | = | 398363 100 | × | 4 | − | 398363 100 | × | 3 25 |
3 10 | ( | 39331 | − | X | ) | − | 3 50 | ( | 39331 | − | X | ) | + | 1 5 | X | ( | 4 | − | 3 25 | ) | = | 398363 25 | − | 1195089 2500 |
3 10 | ( | 39331 | − | X | ) | − | 3 50 | ( | 39331 | − | X | ) | + | 1 5 | X | ( | 4 | − | 3 25 | ) | = | 38641211 2500 |
3 10 | × | 39331 | − | 3 10 | X | − | 3 50 | ( | 39331 | − | X | ) | + | 1 5 | X | ( | 4 | − | 3 25 | ) | = | 38641211 2500 |
117993 10 | − | 3 10 | X | − | 3 50 | ( | 39331 | − | X | ) | + | 1 5 | X | ( | 4 | − | 3 25 | ) | = | 38641211 2500 |
117993 10 | − | 3 10 | X | − | 3 50 | × | 39331 | + | 3 50 | X | + | 1 5 | X | ( | 4 | − | 3 25 | ) | = | 38641211 2500 |
117993 10 | − | 3 10 | X | − | 117993 50 | + | 3 50 | X | + | 1 5 | X | ( | 4 | − | 3 25 | ) | = | 38641211 2500 |
235986 25 | − | 6 25 | X | + | 1 5 | X | ( | 4 | − | 3 25 | ) | = | 38641211 2500 |
235986 25 | − | 6 25 | X | + | 1 5 | X | × | 4 | − | 1 5 | X | × | 3 25 | = | 38641211 2500 |
235986 25 | − | 6 25 | X | + | 4 5 | X | − | 3 125 | X | = | 38641211 2500 |
235986 25 | + | 67 125 | X | = | 38641211 2500 |
67 125 | X | = | 38641211 2500 | − | 235986 25 |
67 125 | X | = | 15042611 2500 |
| X | = | 15042611 2500 | ÷ | 67 125 |
| = | 15042611 2500 | × | 125 67 |
| = | 15042611 20 | × | 1 67 |
| X | = | 15042611 1340 |
| X | = | 11225.829104 |