What minus 21 equals 9?
Here we will show you how to calculate "What minus 21 equals 9?" using simple algebra.
For the sentence, "What minus 21 equals 9?", we can make it into an algebra equation as follows:
X - 21 = 9
Then, we solve for X. To solve for X, add 21 to both sides:
X - 21 + 21 = 9 + 21
Which makes:
X = 30
Thus, the answer to "What minus 21 equals 9?" is 30 as illustrated below:
30 - 21 = 9