21 | ( | x | − | 4 | ) | = | 14 | ( | x | + | 1 | ) |
Left side of the equation = | 21 | x | − | 21 | × | 4 |
= | 21 | x | − | 84 |
21 | x | − | 84 | = | 14 | ( | x | + | 1 | ) |
Right side of the equation = | 14 | x | + | 14 | × | 1 |
= | 14 | x | + | 14 |
21 | x | − | 84 | = | 14 | x | + | 14 |
21 | x | − | 14 | x | = | 14 | + | 84 |
7 | x | = | 14 | + | 84 |
7 | x | = | 98 |
x | = | 98 | ÷ | 7 |
= | 98 | × | 1 7 |
= | 14 | × | 1 |
x | = | 14 |