19520 | ( | 20 | + | 770 | x | ) | = | 713964 |
方程左边 = | 19520 | × | 20 | + | 19520 | × | 770 | x |
= | 390400 | + | 15030400 | x |
390400 | + | 15030400 | x | = | 713964 |
15030400 | x | = | 713964 | − | 390400 |
15030400 | x | = | 323564 |
x | = | 323564 | ÷ | 15030400 |
= | 323564 | × | 1 15030400 |
= | 80891 | × | 1 3757600 |
x | = | 80891 3757600 |
x | = | 0.021527 |