| ( | 8500 | + | 20 | + | X | ) | ( | 266287 5000000 | + | 3 200 | ) | × | 1 | ÷ | 4 | = | X |
| Left side of the equation = | ( | 8500 | + | 20 | + | X | ) | ( | 266287 5000000 | + | 3 200 | ) | × | 1 4 |
| ( | 8500 | + | 20 | + | X | ) | ( | 266287 5000000 | + | 3 200 | ) | × | 1 4 | = | X |
| Left side of the equation = | 8500 | ( | 266287 5000000 | + | 3 200 | ) | × | 1 4 | + | 20 | ( | 266287 5000000 | + | 3 200 | ) | × | 1 4 | + | X | ( | 266287 5000000 | + | 3 200 | ) | × | 1 4 |
| = | 2125 | ( | 266287 5000000 | + | 3 200 | ) | + | 5 | ( | 266287 5000000 | + | 3 200 | ) | + | X | ( | 266287 5000000 | + | 3 200 | ) | × | 1 4 |
| = | 2125 | × | 266287 5000000 | + | 2125 | × | 3 200 | + | 5 | ( | 266287 5000000 | + | 3 200 | ) | + | X | ( | 266287 5000000 | + | 3 200 | ) | × | 1 4 |
| = | 4526879 40000 | + | 255 8 | + | 5 | ( | 266287 5000000 | + | 3 200 | ) | + | X | ( | 266287 5000000 | + | 3 200 | ) | × | 1 4 |
| = | 5801879 40000 | + | 5 | ( | 266287 5000000 | + | 3 200 | ) | + | X | ( | 266287 5000000 | + | 3 200 | ) | × | 1 4 |
| = | 5801879 40000 | + | 5 | × | 266287 5000000 | + | 5 | × | 3 200 | + | X | ( | 266287 5000000 | + | 3 200 | ) | × | 1 4 |
| = | 5801879 40000 | + | 266287 1000000 | + | 3 40 | + | X | ( | 266287 5000000 | + | 3 200 | ) | × | 1 4 |