I live in Pomona and i need help with my homework so I don't have a bad grade in school.

The way you solve problems like this is use algebra to get the variable(in this problem n) on the left and the numbers on the right.

- The first step is to solve 3(n-7) which can use the distributive property to show that this equals 3(n) - (3)(7) which equals 3n - 21. This means the equation is now -17 + 4n = 3n - 21
- The next step is to add 17 to each side. This means that the equation is now 4n = 3n - 4
- Next we subtract 3n from each side leaving us with n = -4.

Therefore, the answer is n = -4.

Let me know if this is still unclear. I would be happy to explain it more.