5 | × | 75 | + | ( | 15 | ( | x | ÷ | 10 | ) | − | 8 | ) | × | 90 | = | 735 |
方程左边 = | 375 | + | ( | 15 | ( | x | ÷ | 10 | ) | − | 8 | ) | × | 90 |
375 | + | ( | 15 | ( | x | ÷ | 10 | ) | − | 8 | ) | × | 90 | = | 735 |
方程左边 = | 375 | + | 15 | ( | x | ÷ | 10 | ) | × | 90 | − | 8 | × | 90 |
= | 375 | + | 1350 | ( | x | ÷ | 10 | ) | − | 720 |
= | - | 345 | + | 1350 | ( | x | ÷ | 10 | ) |
= | - | 345 | + | 1350 | x | ÷ | 10 |
= | - | 345 | + | 135 | x |
- | 345 | + | 135 | x | = | 735 |
135 | x | = | 735 | + | 345 |
135 | x | = | 1080 |
x | = | 1080 | ÷ | 135 |
= | 1080 | × | 1 135 |
= | 8 | × | 1 |
x | = | 8 |