( | 60 | + | x | − | 40 | ) | ( | 300 | − | 10 | x | ) | = | 0 |
Left side of the equation = | 60 | ( | 300 | − | 10 | x | ) | + | x | ( | 300 | − | 10 | x | ) | − | 40 | ( | 300 | − | 10 | x | ) |
= | 60 | × | 300 | − | 60 | × | 10 | x | + | x | ( | 300 | − | 10 | x | ) | − | 40 | ( | 300 | − | 10 | x | ) |
= | 18000 | − | 600 | x | + | x | ( | 300 | − | 10 | x | ) | − | 40 | ( | 300 | − | 10 | x | ) |
= | 18000 | − | 600 | x | + | x | × | 300 | − | x | × | 10 | x | − | 40 | ( | 300 | − | 10 | x | ) |
= | 18000 | − | 300 | x | − | x | × | 10 | x | − | 40 | ( | 300 | − | 10 | x | ) |
= | 18000 | − | 300 | x | − | x | × | 10 | x | − | 40 | × | 300 | + | 40 | × | 10 | x |
= | 18000 | − | 300 | x | − | x | × | 10 | x | − | 12000 | + | 400 | x |
= | 6000 | + | 100 | x | − | x | × | 10 | x |
6000 | + | 100 | x | − | x | × | 10 | x | = | 0 |