( | X | + | 24 | ) | × | 10 | ÷ | 2 | − | ( | 24 | − | X | ) | × | 10 | ÷ | 2 | = | 150 |
方程左边 = | ( | X | + | 24 | ) | × | 5 | − | ( | 24 | − | X | ) | × | 5 |
( | X | + | 24 | ) | × | 5 | − | ( | 24 | − | X | ) | × | 5 | = | 150 |
方程左边 = | X | × | 5 | + | 24 | × | 5 | − | ( | 24 | − | X | ) | × | 5 |
= | X | × | 5 | + | 120 | − | ( | 24 | − | X | ) | × | 5 |
= | 5 | X | + | 120 | − | 24 | × | 5 | + | X | × | 5 |
= | 5 | X | + | 120 | − | 120 | + | X | × | 5 |
= | 10 | X | + | 0 |
10 | X | = | 150 |
X | = | 150 | ÷ | 10 |
= | 150 | × | 1 10 |
= | 15 | × | 1 |
X | = | 15 |