What minus 9 equals 78?

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