$$( - 3 \frac { 1 } { 5 } ) + ( 3 \frac { 1 } { 5 } )$$
$0$
$$-\frac{15+1}{5}+\frac{3\times 5+1}{5}$$
$$-\frac{16}{5}+\frac{3\times 5+1}{5}$$
$$-\frac{16}{5}+\frac{15+1}{5}$$
$$-\frac{16}{5}+\frac{16}{5}$$
$$0$$
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