30 | × | 69 | + | 75 | x | + | 100 | ( | 70 | − | x | ) | = | 431 5 | × | 100 |
Left side of the equation = | 2070 | + | 75 | x | + | 100 | ( | 70 | − | x | ) |
2070 | + | 75 | x | + | 100 | ( | 70 | − | x | ) | = | 431 5 | × | 100 |
Left side of the equation = | 2070 | + | 75 | x | + | 100 | × | 70 | − | 100 | x |
= | 2070 | + | 75 | x | + | 7000 | − | 100 | x |
= | 9070 | − | 25 | x |
9070 | − | 25 | x | = | 431 5 | × | 100 |
Right side of the equation = | 8620 |
9070 | − | 25 | x | = | 8620 |
- | 25 | x | = | 8620 | − | 9070 |
- | 25 | x | = | - | 450 |
450 | = | 25 | x |
25 | x | = | 450 |
x | = | 450 | ÷ | 25 |
= | 450 | × | 1 25 |
= | 18 | × | 1 |
x | = | 18 |