N= 12
Because ⬇️⬇️
1 over 3*n (4) = 0
Simplify ➡️ 1 over 3
(1 over 3 * n) - 4 = 0
Subtract a whole from the fraction
4 = 4 over 1 = 4 * 3 over 3
N - (4 * 3) over 3 = n - 12 over 3
N - 12 over 3 = 0
N- 12 over 3 * 3 = 0 * 3
N - 12 = 0
And that's how I how figured that "n" = 12