$$\frac { 3 } { 7 } + ( \frac { - 6 } { 11 } ) + ( \frac { - 8 } { 21 } ) + ( \frac { 5 } { 22 } ) + 1$$
$\frac{337}{462}\approx 0.729437229$
$$\frac{3}{7}-\frac{6}{11}+\frac{-8}{21}+\frac{5}{22}+1$$
$$\frac{33}{77}-\frac{42}{77}+\frac{-8}{21}+\frac{5}{22}+1$$
$$\frac{33-42}{77}+\frac{-8}{21}+\frac{5}{22}+1$$
$$-\frac{9}{77}+\frac{-8}{21}+\frac{5}{22}+1$$
$$-\frac{9}{77}-\frac{8}{21}+\frac{5}{22}+1$$
$$-\frac{27}{231}-\frac{88}{231}+\frac{5}{22}+1$$
$$\frac{-27-88}{231}+\frac{5}{22}+1$$
$$-\frac{115}{231}+\frac{5}{22}+1$$
$$-\frac{230}{462}+\frac{105}{462}+1$$
$$\frac{-230+105}{462}+1$$
$$-\frac{125}{462}+1$$
$$-\frac{125}{462}+\frac{462}{462}$$
$$\frac{-125+462}{462}$$
$$\frac{337}{462}$$
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$\frac{337}{2 \cdot 3 \cdot 7 \cdot 11} = 0.7294372294372294$
