( | 1200 | + | x | ) | × | 7 5 | × | 25 | × | 31 20 | = | 0 |
Left side of the equation = | ( | 1200 | + | x | ) | × | 217 4 |
( | 1200 | + | x | ) | × | 217 4 | = | 0 |
Left side of the equation = | 1200 | × | 217 4 | + | x | × | 217 4 |
= | 65100 | + | x | × | 217 4 |
65100 | + | 217 4 | x | = | 0 |
217 4 | x | = | 0 | − | 65100 |
217 4 | x | = | - | 65100 |
x | = | - | 65100 | ÷ | 217 4 |
= | - | 65100 | × | 4 217 |
= | - | 300 | × | 4 |
x | = | - | 1200 |