( | x | + | 2 | + | 2 | ) | ( | x | + | 2 | + | 2 | ) | - | x | x | = | 80 |
Left side of the equation = | x | ( | x | + | 2 | + | 2 | ) | + | 2 | ( | x | + | 2 | + | 2 | ) | + | 2 | ( | x | + | 2 | + | 2 | ) | - | x | x |
= | x | x | + | x | × | 2 | + | x | × | 2 | + | 2 | ( | x | + | 2 | + | 2 | ) | + | 2 | ( | x | + | 2 | + | 2 | ) | - | x | x |
= | x | x | + | 4 | x | + | 2 | ( | x | + | 2 | + | 2 | ) | + | 2 | ( | x | + | 2 | + | 2 | ) | - | x | x |
= | x | x | + | 4 | x | + | 2 | x | + | 2 | × | 2 | + | 2 | × | 2 | + | 2 | ( | x | + | 2 | + | 2 | ) | - | x | x |
= | x | x | + | 4 | x | + | 2 | x | + | 4 | + | 4 | + | 2 | ( | x | + | 2 | + | 2 | ) | - | x | x |
= | x | x | + | 6 | x | + | 8 | + | 2 | ( | x | + | 2 | + | 2 | ) | - | x | x |
= | x | x | + | 6 | x | + | 8 | + | 2 | x | + | 2 | × | 2 | + | 2 | × | 2 | - | x | x |
= | x | x | + | 6 | x | + | 8 | + | 2 | x | + | 4 | + | 4 | - | x | x |
= | x | x | + | 8 | x | + | 16 | - | x | x |
x | x | + | 8 | x | + | 16 | - | x | x | = | 80 |