$$\frac { 1 } { 1 } - \frac { 1 } { 1 } = \frac { 1 } { 15 }$$
$\text{false}$
$$1-\frac{1}{1}=\frac{1}{15}$$
$$1-1=\frac{1}{15}$$
$$0=\frac{1}{15}$$
$$\text{false}$$
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