( | x | + | 3 | ) | ( | 2 | x | + | 5 | ) | − | x | ( | 3 | x | − | 1 | ) | = | 15 |
Left side of the equation = | x | ( | 2 | x | + | 5 | ) | + | 3 | ( | 2 | x | + | 5 | ) | − | x | ( | 3 | x | − | 1 | ) |
= | x | × | 2 | x | + | x | × | 5 | + | 3 | ( | 2 | x | + | 5 | ) | − | x | ( | 3 | x | − | 1 | ) |
= | x | × | 2 | x | + | 5 | x | + | 3 | × | 2 | x | + | 3 | × | 5 | − | x | ( | 3 | x | − | 1 | ) |
= | x | × | 2 | x | + | 5 | x | + | 6 | x | + | 15 | − | x | ( | 3 | x | − | 1 | ) |
= | x | × | 2 | x | + | 11 | x | + | 15 | − | x | ( | 3 | x | − | 1 | ) |
= | x | × | 2 | x | + | 11 | x | + | 15 | − | x | × | 3 | x | + | x | × | 1 |
= | x | × | 2 | x | + | 12 | x | + | 15 | − | x | × | 3 | x |
x | × | 2 | x | + | 12 | x | + | 15 | − | x | × | 3 | x | = | 15 |