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Remove Number Under x


Here you’ll learn how to get rid of the denominator of a fraction where a variable, such as x, is in the numerator. This is another form of isolating the variable that you need to learn in order to be able to solve equations.

Rule

Removing a Denominator from Under a Variable

1.
Move all the terms containing only numbers over to one side. Remember to change signs.
2.
Move all terms containing x to the opposite side of from the terms containing only numbers. Remember to change signs.
3.
Simplify both sides.
4.
Multiply both sides by the denominator—the number that x is divided by.

Example 1

x 3 4 = 3 x 3 = 3 + 4 x 3 = 7 3 x 3 = 7 3 3 x 3 = 7 3 x = 21

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