what's the error in this problem pls help im being timed

Answer:
they added 6 on the right instead of subtracting 6
Step-by-step explanation:
Answer:
The second line in the student's work. 5x-6=7x+16
Step-by-step explanation:
In the student's work on the second line, the student incorrectly did 10-6, which equals 4, not 16. So, the correct step should be 5x-6=7x+4.