The equation [tex]\frac{18-24}{-6}[/tex] can be solved by solving first the expression in the numerator. This is done by solving [tex]18-24=-6[/tex].
Then, you just have [tex]\frac{-6}{-6}[/tex]. The negative is canceled when it appears twice, so we just have to solve [tex]\frac{6}{6}=1[/tex] (any number divided by itself equals to one).
