$$\frac { 9 c m } { 9 c m }$$
$1$
$$\frac{9^{1}c^{1}m^{1}}{9^{1}c^{1}m^{1}}$$
$$9^{1-1}c^{1-1}m^{1-1}$$
$$9^{0}c^{1-1}m^{1-1}$$
$$c^{1-1}m^{1-1}$$
$$c^{0}m^{1-1}$$
$$m^{1-1}$$
$$c^{0}m^{0}$$
$$9^{0}$$
$$1$$
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