( | x | ÷ | 2 | × | 2 | + | 3 | − | 9 | × | 1 | − | 4 | × | 9 | ÷ | 9 | + | 9 | − | 3 | + | 4 | ) | × | 2 | − | ( | 1 | × | 2 | × | 3 | + | 1 | ) | × | 20 | = | 0 |
方程左边 = | x | ÷ | 2 | × | 2 | × | 2 | + | 3 | × | 2 | − | 9 | × | 1 | × | 2 | − | 4 | × | 9 | ÷ | 9 |
= | x | × | 2 | + | 6 | − | 18 | − | 8 | + | 18 | − | 6 | + | 8 | − | ( | 1 | × | 2 | × | 3 | + | 1 | ) | × | 20 |
= | 2 | x | − | 0 | − | ( | 1 | × | 2 | × | 3 | + | 1 | ) | × | 20 |
= | 2 | x | − | 0 | − | 1 | × | 2 | × | 3 | × | 20 | − | 1 | × | 20 |
= | 2 | x | − | 0 | − | 120 | − | 20 |
= | 2 | x | − | 140 |
2 | x | − | 140 | = | 0 |
2 | x | = | 0 | + | 140 |
2 | x | = | 140 |
x | = | 140 | ÷ | 2 |
= | 140 | × | 1 2 |
= | 70 | × | 1 |
x | = | 70 |