You need to add 2/3 to both sides to get
[tex] x -\frac{2}{3}+\frac{2}{3} = \frac{5}{6}+\frac{2}{3} [/tex]
which simplifies into
[tex] x = \frac{3}{2} [/tex]
Answer: A. She should have added 5.4 to each side
Step-by-step explanation: