Here we will show you how to calculate "what" in this sentence: "1/3 minus what equals 1/7?" We start by making this word problem into an algebraic equation where "what" is the variable "x".

1/3 - x = 1/7

To solve this equation, we want x alone on the left side of the equation so we start by subtracting 1/3 on both sides like this:

1/3 - 1/3 - x = 1/7 - 1/3

1/3 - 1/3 - x leaves -x and 1/7 - 1/3 is -4/21 which means we end up with -x = -4/21. Then, you multiply each side by -1 to get x = 4/21. Therefore, the answer to "1/3 minus what equals 1/7?" is as follows:

**4/21**

It is always good to double-check your math to make sure you did it right. When we entered 4/21 for x in this equation 1/3 - x = 1/7, we get the following true equation which means our math is correct.

1/3 - 4/21 = 1/7

**Fraction Minus What Equals Fraction Calculator**

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