231 5 | × | 3 5 | + | 231 5 | × | 3 5 | b | = | 12243 500 |
| Left side of the equation = | 693 25 | + | 693 25 | b |
693 25 | + | 693 25 | b | = | 12243 500 |
693 25 | b | = | 12243 500 | − | 693 25 |
693 25 | b | = | - | 1617 500 |
| b | = | - | 1617 500 | ÷ | 693 25 |
| = | - | 1617 500 | × | 25 693 |
| = | - | 7 20 | × | 1 3 |
| b | = | - | 7 60 |
| b | = | - 0.116667 |