Ok then after that what’s the question ?
First add 5 to right side

Next , to cancel the 7, you need to multiply by 7 on both sides
Find how many oz she ate: 1/2 of 3 is 1.5. 3/4 of 3 is 2.25. 1/2 of 2 is 1. Add all of the oz: 1.5+2.25+1=4.75. She ate 4.75 oz :)