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Work: Find the solution of equation 500-(493.7-x)/(493.7-x) = 1.26 .
Question type: Equation
Solution:Original question:| | 500 | − | ( | 4937 10 | − | x | ) | ÷ | ( | 4937 10 | − | x | ) | = | 63 50 |
| Multiply both sides of the equation by: | ( | 4937 10 | − | x | ) |
| | 500 | ( | 4937 10 | − | x | ) | − | ( | 4937 10 | − | x | ) | = | 63 50 | ( | 4937 10 | − | x | ) |
Remove a bracket on the left of the equation::
| | 500 | × | 4937 10 | − | 500 | x | − | ( | 4937 10 | − | x | ) | = | 63 50 | ( | 4937 10 | − | x | ) |
Remove a bracket on the right of the equation::
| | 500 | × | 4937 10 | − | 500 | x | − | ( | 4937 10 | − | x | ) | = | 63 50 | × | 4937 10 | − | 63 50 | x |
The equation is reduced to :
| | 246850 | − | 500 | x | − | ( | 4937 10 | − | x | ) | = | 311031 500 | − | 63 50 | x |
Remove a bracket on the left of the equation:
| | 246850 | − | 500 | x | − | 4937 10 | + | x | = | 311031 500 | − | 63 50 | x |
The equation is reduced to :
| | 2463563 10 | − | 499 | x | = | 311031 500 | − | 63 50 | x |
Transposition :
| | - | 499 | x | + | 63 50 | x | = | 311031 500 | − | 2463563 10 |
Combine the items on the left of the equation:
| | - | 24887 50 | x | = | 311031 500 | − | 2463563 10 |
Combine the items on the right of the equation:
| | - | 24887 50 | x | = | - | 122867119 500 |
By shifting the terms and changing the symbols on toth sides of the equation, we obtain :
If the left side of the equation is equal to the right side, then the right side must also be equal to the left side, that is :
The coefficient of the unknown number is reduced to 1 :
| | x | = | 122867119 500 | ÷ | 24887 50 |
We obtained :
However,when simplifying the equation, multiply both sides by ( | 4937 10 | − | x | ) | , and when
, its value is 0. Therefore, the value of this unknown number is not the solution of the equation, and the input to the equation is incorrect.
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