$$6 + ( \frac { 7 } { 13 } - \frac { 3 } { 26 } )$$
$\frac{167}{26}\approx 6.423076923$
$$\frac{78}{13}+\frac{7}{13}-\frac{3}{26}$$
$$\frac{78+7}{13}-\frac{3}{26}$$
$$\frac{85}{13}-\frac{3}{26}$$
$$\frac{170}{26}-\frac{3}{26}$$
$$\frac{170-3}{26}$$
$$\frac{167}{26}$$
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$\frac{167}{2 \cdot 13} = 6\frac{11}{26} = 6.423076923076923$