What minus 31 equals 90?

Here we will show you how to calculate "What minus 31 equals 90?" using simple algebra.
For the sentence, "What minus 31 equals 90?", we can make it into an algebra equation as follows:
X - 31 = 90
Then, we solve for X. To solve for X, add 31 to both sides:
X - 31 + 31 = 90 + 31
Which makes:
X = 121
Thus, the answer to "What minus 31 equals 90?" is 121 as illustrated below:
121 - 31 = 90