Convert mixed number to fraction.
$$\dfrac{ -18 }{ 6 }$$ .Simplify $ \dfrac{ -18 }{ 6 } $ by dividing both -18 and 6 by their GCD, which is 6. GCD(-18, 6) = 6.
$$ \frac{ 18 }{ 6 } = \frac{ 18 : \color{blue}{ 6 } }{ 6 : \color{blue}{ 6 } } = \frac{ -3 }{ 1 } $$