7. What is the error?
3x + 5 - 2x = 10
+2x +2x = 10
5x + 5 = 10
-5
-5
5x
= 5
5
5
x = 1
A. Adding 2x to 3x
B. Subtracting 5 from both sides
C. Adding 2x to -2x
D. Dividing by 5 on both sides