What minus 42 equals 81?

Here we will show you how to calculate "What minus 42 equals 81?" using simple algebra.
For the sentence, "What minus 42 equals 81?", we can make it into an algebra equation as follows:
X - 42 = 81
Then, we solve for X. To solve for X, add 42 to both sides:
X - 42 + 42 = 81 + 42
Which makes:
X = 123
Thus, the answer to "What minus 42 equals 81?" is 123 as illustrated below:
123 - 42 = 81