3 | ÷ | 30 | + | ( | 3 | + | x | ) | ÷ | 20 | = | 1 |
Left side of the equation = | 1 10 | + | ( | 3 | + | x | ) | × | 1 20 |
1 10 | + | ( | 3 | + | x | ) | × | 1 20 | = | 1 |
Left side of the equation = | 1 10 | + | 3 | × | 1 20 | + | x | × | 1 20 |
= | 1 10 | + | 3 20 | + | x | × | 1 20 |
= | 1 4 | + | 1 20 | x |
1 4 | + | 1 20 | x | = | 1 |
1 20 | x | = | 1 | − | 1 4 |
1 20 | x | = | 3 4 |
x | = | 3 4 | ÷ | 1 20 |
= | 3 4 | × | 20 |
= | 3 | × | 5 |
x | = | 15 |