That would be \(\frac{-8}{12}\), but it is also equal to just \(-\frac{8}{12}\). You would simplify the \(\frac{8}{12}\) part, and you would get \(\frac{2}{3}\), or if you need a decimal, \(0.6666...\)
But don't forget the negative part, so the answer would be \(-\frac{2}{3}\) or \(-0.6666...\)