[tex] \frac{7}{8} - \frac{5}{6} [/tex]
So we need to find a common denominator, or else we can't do anything with these fractions.
We cross multiply;
= [tex] \frac{7*6}{8*6} - \frac{5*8}{6*8} [/tex]
= [tex] \frac{42}{48} - \frac{40}{48}[/tex]
= [tex] \frac{2}{48} [/tex]
= [tex] \frac{1}{24} [/tex]
