Although x ² and x both have the variable x, you can’t add them together. So x + x + x + x is 4x and we just leave x ² the same. So the simplified expression is x ² + 4x. I hope this helped!!
Answer:
C choice.
Step-by-step explanation:

First, we move the same terms to the same side.

Then we move 6 to divide - 18.

The answer is C 16:20 because both numbers 4&5 are multiplied by four