$$\frac{7}{8}+\frac{-1}{7}=\frac{-1}{7}+\frac{17}{8}$$
$\text{false}$
$$\frac{7}{8}-\frac{1}{7}=\frac{-1}{7}+\frac{17}{8}$$
$$\frac{49}{56}-\frac{8}{56}=\frac{-1}{7}+\frac{17}{8}$$
$$\frac{49-8}{56}=\frac{-1}{7}+\frac{17}{8}$$
$$\frac{41}{56}=\frac{-1}{7}+\frac{17}{8}$$
$$\frac{41}{56}=-\frac{1}{7}+\frac{17}{8}$$
$$\frac{41}{56}=-\frac{8}{56}+\frac{119}{56}$$
$$\frac{41}{56}=\frac{-8+119}{56}$$
$$\frac{41}{56}=\frac{111}{56}$$
$$\text{false}$$
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