60 | x | + | ( | 100 | - | x | ) | × | 70 | = | 100 | × | 63 |
Left side of the equation = | 60 | x | + | 100 | × | 70 | - | x | × | 70 |
= | 60 | x | + | 7000 | - | x | × | 70 |
= | - | 10 | x | + | 7000 |
- | 10 | x | + | 7000 | = | 100 | × | 63 |
Right side of the equation = | 6300 |
- | 10 | x | + | 7000 | = | 6300 |
- | 10 | x | = | 6300 | - | 7000 |
- | 10 | x | = | - | 700 |
10 | x | = | 700 |
x | = | 700 | ÷ | 10 |
= | 700 | × | 1 10 |
= | 70 | × | 1 |
x | = | 70 |