2 | x | + | ( | 20 | − | x | ) | + | 2 | ( | x | − | 3 | ) | + | 5 | = | 49 |
Left side of the equation = | 2 | x | + | 20 | − | x | + | 2 | ( | x | − | 3 | ) | + | 5 |
= | 1 | x | + | 25 | + | 2 | ( | x | − | 3 | ) |
= | 1 | x | + | 25 | + | 2 | x | − | 2 | × | 3 |
= | 1 | x | + | 25 | + | 2 | x | − | 6 |
= | 3 | x | + | 19 |
3 | x | + | 19 | = | 49 |
3 | x | = | 49 | − | 19 |
3 | x | = | 30 |
x | = | 30 | ÷ | 3 |
= | 30 | × | 1 3 |
= | 10 | × | 1 |
x | = | 10 |