What minus 81 equals 42?

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