The profit, p, an ice cream store makes in one day when producing x gallons of ice cream is given the equation p=60x-420. how many gallons of ice cream is produced when the stores profit is equal to 0$

Here's the equation:
0 = 60 x gallons - 420
In order to get how many gallons you need to make 0$ in profit, you need to:

1) Divide 420÷60

2) 420÷60=7

3) Plug it in: 0 = 60 x 7 - 420

4) Does it work? Yes.

5) Therefore, the answer is 7.