2 | x | + | x | + | ( | 3 | x | + | 400 | ) | = | 42400 |
Left side of the equation = | 3 | x | + | ( | 3 | x | + | 400 | ) |
3 | x | + | ( | 3 | x | + | 400 | ) | = | 42400 |
Left side of the equation = | 3 | x | + | 3 | x | + | 400 |
= | 6 | x | + | 400 |
6 | x | + | 400 | = | 42400 |
6 | x | = | 42400 | − | 400 |
6 | x | = | 42000 |
x | = | 42000 | ÷ | 6 |
= | 42000 | × | 1 6 |
= | 7000 | × | 1 |
x | = | 7000 |