Equations
Unfold
Math OP
Fold
Linear algebra
Unfold
Mathematical calculation：
Enter the mathematical formula directly and click the "Next" button to get the calculation answer.
It supports mathematical functions (including trigonometric functions).
Enter the mathematical formula directly and click the "Next" button to get the calculation answer.
It supports mathematical functions (including trigonometric functions).
Current location：Mathematical operation > History of Mathematical Computation > Answer
Overview: 1 questions will be solved this time.Among them
☆1 equations
[ 1/1 Equation]
Work: Find the solution of equation X+21 = X÷3+9 .
Question type: Equation
Solution:Original question:
| X | + | 21 | = | X | ÷ | 3 | + | 9 |
Transposition :
| X | − | 1 3 | X | = | 9 | − | 21 |
Combine the items on the left of the equation:
2 3 | X | = | 9 | − | 21 |
Combine the items on the right of the equation:
2 3 | X | = | - | 12 |
The coefficient of the unknown number is reduced to 1 :
| X | = | - | 12 | ÷ | 2 3 |
| = | - | 12 | × | 3 2 |
| = | - | 6 | × | 3 |
We obtained :
| X | = | - | 18 |