( -2/3 + 3/13 ) : 7/8 + ( -1/3 + 10/13 ) : 7/8

$(\dfrac{-2}{3}+$ $\dfrac{3}{13})$ `:` $\dfrac{7}{8}$ + `(`$\dfrac{-1}{3}+$ $\dfrac{10}{13}$ `)` `:` $\dfrac{7}{8}$

`<=>` `` ($\dfrac{-2}{3}+$ $\dfrac{3}{13}$`+`$\dfrac{-1}{3}+$ $\dfrac{10}{13}$) `:` $\dfrac{7}{8}$

`=` `(-1+1)` `:` $\dfrac{7}{8}$

`=0` `:` $\dfrac{7}{8}$

`=0`