Kaitlyn solved the equation for x using the following calculations. Negative 5.4 + x = 12.2. Minus 5.4. x = 6.8. What error, if any, did she make? She should have added 5.4 to each side. She should have added the inverse of 5.4 to each side. She made a computational error when she subtracted 5.4 from 12.2. She should have added 12.2 to each side.