9/5 plus what equals 4/5?

Here we will show you how to calculate "what" in this sentence: "9/5 plus what equals 4/5?" We start by making this word problem into an algebraic equation where "what" is the variable "x".

9/5 + x = 4/5

To solve this equation, we want x alone on the left side of the equation so we start by subtracting 9/5 on both sides like this:

9/5 - 9/5 + x = 4/5 - 9/5

9/5 - 9/5 + x leaves x and 4/5 - 9/5 is -1 which means we end up with x = -1. Therefore, the answer to "9/5 plus what equals 4/5?" is as follows:

-1

It is always good to double-check your math to make sure you did it right. When we entered -1 for x in this equation 9/5 + x = 4/5, we get the following true equation which means our math is correct.

9/5 + -1 = 4/5

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