( | x | + | 3 | ) | ( | x | + | 3 | ) | + | ( | 6 | − | x | ) | ( | 6 | − | x | ) | = | 7 |
Left side of the equation = | x | ( | x | + | 3 | ) | + | 3 | ( | x | + | 3 | ) | + | ( | 6 | − | x | ) | ( | 6 | − | x | ) |
= | x | x | + | x | × | 3 | + | 3 | ( | x | + | 3 | ) | + | ( | 6 | − | x | ) | ( | 6 | − | x | ) |
= | x | x | + | 3 | x | + | 3 | x | + | 3 | × | 3 | + | ( | 6 | − | x | ) | ( | 6 | − | x | ) |
= | x | x | + | 3 | x | + | 3 | x | + | 9 | + | ( | 6 | − | x | ) | ( | 6 | − | x | ) |
= | x | x | + | 6 | x | + | 9 | + | ( | 6 | − | x | ) | ( | 6 | − | x | ) |
= | x | x | + | 6 | x | + | 9 | + | 6 | ( | 6 | − | x | ) | − | x | ( | 6 | − | x | ) |
= | x | x | + | 6 | x | + | 9 | + | 6 | × | 6 | − | 6 | x | − | x | ( | 6 | − | x | ) |
= | x | x | + | 6 | x | + | 9 | + | 36 | − | 6 | x | − | x | ( | 6 | − | x | ) |
= | x | x | + | 0 | x | + | 45 | − | x | ( | 6 | − | x | ) |
= | x | x | + | 0 | x | + | 45 | − | x | × | 6 | + | x | x |
= | x | x | − | 6 | x | + | 45 | + | x | x |
x | x | − | 6 | x | + | 45 | + | x | x | = | 7 |