( | 89 | + | 300 | + | 90 | + | 87 | + | x | ) | ÷ | 7 | = | 189 2 |
方程左边 = | 89 | × | 1 7 | + | 300 | × | 1 7 | + | 90 | × | 1 7 | + | 87 | × | 1 7 | + | x | × | 1 7 |
= | 89 7 | + | 300 7 | + | 90 7 | + | 87 7 | + | x | × | 1 7 |
= | 566 7 | + | 1 7 | x |
566 7 | + | 1 7 | x | = | 189 2 |
1 7 | x | = | 189 2 | − | 566 7 |
1 7 | x | = | 191 14 |
x | = | 191 14 | ÷ | 1 7 |
= | 191 14 | × | 7 |
= | 191 2 | × | 1 |
x | = | 191 2 |
x | = | 95.5 |