Step-by-step explanation:
1. you set each expression equal to 0.
x-7=0 and x+3=0
2. Next you need to get the variable by itself so you would add 7 to both sides on the first equation and subtract 3 from both sides for the second one.
3. So your answers would be x=7 and x=-3. Those are the zeros.
It should be 23/99
23/99= 0.232323...
23/999= 0.023023023....
2/9= 0.222222....
Final answer: 23/99