( | a | × | 1 5 | + | a | ) | × | 1 5 | + | ( | a | × | 1 5 | ) | + | a | = | 171000 |
Left side of the equation = | a | × | 1 5 | × | 1 5 | + | a | × | 1 5 | + | ( | a | × | 1 5 | ) | + | a |
= | a | × | 1 25 | + | a | × | 1 5 | + | ( | a | × | 1 5 | ) | + | a |
= | 31 25 | a | + | ( | a | × | 1 5 | ) |
= | 31 25 | a | + | a | × | 1 5 |
= | 36 25 | a |
36 25 | a | = | 171000 |
a | = | 171000 | ÷ | 36 25 |
= | 171000 | × | 25 36 |
= | 4750 | × | 25 |
a | = | 118750 |