( $\frac{1}{3}$ + $\frac{12}{67}$ + $\frac{13}{41}$ )+ ( $\frac{79}{67}$ - $\frac{28}{41}$ )
= $\frac{1}{3}$ + $\frac{12}{67}$ + $\frac{13}{41}$ + $\frac{79}{67}$ - $\frac{28}{41}$
= ( $\frac{12}{67}$ - $\frac{79}{67}$ ) + ($\frac{13}{41}$ + $\frac{28}{41}$ ) + $\frac{1}{3}$
= (-1) + 1 + $\frac{1}{3}$
= 0 + $\frac{1}{3}$
= $\frac{1}{3}$