# Solve for the Variable Involving Addition, Subtraction, Multiplication, and Division

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Use inverse operations to solve the equation for a variable.

For example, consider the equation a – 4 = 2.

Here, 4 is subtracted from a on the left side.

So, to find the value of a, we use inverse operation of subtraction, that is, addition.

Adding 4 to both the sides, we get:

a – 4 + 4 = 2 + 4

a = 6

ds

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### Help

##### Remember :

The smallest number is the one that comes first while counting.

##### Solution :

To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.

21,27,23

21 is the smallest number.