$$\frac{-3}{8}+\frac{1}{7}=\frac{1}{7}+\frac{-3}{8}$$
$\text{true}$
$$-\frac{3}{8}+\frac{1}{7}=\frac{1}{7}+\frac{-3}{8}$$
$$-\frac{21}{56}+\frac{8}{56}=\frac{1}{7}+\frac{-3}{8}$$
$$\frac{-21+8}{56}=\frac{1}{7}+\frac{-3}{8}$$
$$-\frac{13}{56}=\frac{1}{7}+\frac{-3}{8}$$
$$-\frac{13}{56}=\frac{1}{7}-\frac{3}{8}$$
$$-\frac{13}{56}=\frac{8}{56}-\frac{21}{56}$$
$$-\frac{13}{56}=\frac{8-21}{56}$$
$$-\frac{13}{56}=-\frac{13}{56}$$
$$\text{true}$$
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