# Primary mathematics:Introduction to variables

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A variable is any part of an equasion that replaces a number with something that can represent a number. For example,
. In this case, is the variable. You may have seen this before as __. To solve a variable including problem with one step, you have to get rid of the first number. So for example, take

. To get rid of 36, we need to create . We also need to balance the problem on both sides. Therefore, the problem looks somewhat like this: . Now you solve the problem vertically. So

equals 0, so we can get rid of that. Then we take which equals . Therefore, .

The same overall process goes for other operations, just remember: *Addition is the opposite of subtraction and multiplication is the opposite of division*. By doing the opposite of the operation in the equation, you eliminate the variable and come to an answer.