Answer:
X = 7
Plz double check my work, in case it wrong. Dont want it to be wrong and then you be wrong
Explanation:
If you need the answer 21, and you have to find a way to get what the value of X is, you will have to use subtraction from 21.
21 minus 10 = 11.
11 minus 4 = 7 There fore, the answer should be 7 for X
Double check it by doing (7 + 4) + 10 = 21
11 + 10 = 21
21 = 21