Hi!
When you add a negative number, you really just subtract it. So let's solve this.
Convert the mixed numbers into improper fractions.
[tex] \frac{434}{9} - \frac{351}{9} [/tex]
Solve
434 - 351 = 83
[tex] \frac{83}{9} [/tex]
The sign of this fraction is positive
Hope this helps! :)
-Peredhel
