What minus 78 equals 9?

Here we will show you how to calculate "What minus 78 equals 9?" using simple algebra.
For the sentence, "What minus 78 equals 9?", we can make it into an algebra equation as follows:
X - 78 = 9
Then, we solve for X. To solve for X, add 78 to both sides:
X - 78 + 78 = 9 + 78
Which makes:
X = 87
Thus, the answer to "What minus 78 equals 9?" is 87 as illustrated below:
87 - 78 = 9