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To find out unknown values. For example you know that 100 people appeared for an exam, and 40 people failed. We want to know how many passed. In this example, we can calculate it in our minds, but we can also solve it as:
Just like this, it can be used in complicated unknown values.
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Linear equation means expressions having variables.For example: x + 5 = 7
Now, If you want to know the value of x, you have to solve the equation.
Here, you can solve by transposing the terms. Like x = 7 - 5. And then you get the value of x, that is, 2.
So you need to solve the equation if you want to know the value of the equation.
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