( | s | + | 4 | ) | ( | 3 | s | s | + | 6 | s | + | 2 | ) | − | s | ( | s | + | 1 | ) | ( | s | + | 2 | ) | = | 0 |
Left side of the equation = | s | ( | 3 | s | s | + | 6 | s | + | 2 | ) | + | 4 | ( | 3 | s | s | + | 6 | s | + | 2 | ) | − | s | ( | s | + | 1 | ) | ( | s | + | 2 | ) |
= | s | × | 3 | s | s | + | s | × | 6 | s | + | s | × | 2 | + | 4 | ( | 3 | s | s | + | 6 | s | + | 2 | ) | − | s |
= | s | × | 3 | s | s | + | s | × | 6 | s | + | 2 | s | + | 4 | × | 3 | s |
= | s | × | 3 | s | s | + | s | × | 6 | s | + | 2 | s | + | 12 | s | s |
= | s | × | 3 | s | s | + | s | × | 6 | s | + | 26 | s | + | 12 | s | s |
= | s | × | 3 | s | s | + | s | × | 6 | s | + | 26 | s | + | 12 | s | s |
= | s | × | 3 | s | s | + | s | × | 6 | s | + | 26 | s | + | 12 | s | s |
= | s | × | 3 | s | s | + | s | × | 6 | s | + | 26 | s | + | 12 | s | s |
= | s | × | 3 | s | s | + | s | × | 6 | s | + | 26 | s | + | 12 | s | s |
= | s | × | 3 | s | s | + | s | × | 6 | s | + | 24 | s | + | 12 | s | s |
s | × | 3 | s | s | + | s | × | 6 | s | + | 24 | s | + | 12 | s | s | = | 0 |