What minus 91 equals 80?

Here we will show you how to calculate "What minus 91 equals 80?" using simple algebra.
For the sentence, "What minus 91 equals 80?", we can make it into an algebra equation as follows:
X - 91 = 80
Then, we solve for X. To solve for X, add 91 to both sides:
X - 91 + 91 = 80 + 91
Which makes:
X = 171
Thus, the answer to "What minus 91 equals 80?" is 171 as illustrated below:
171 - 91 = 80