\[- \frac{3c - 5}{4 - c^{2}} + \frac{3 - 2c}{c^{2} - 4} =\]
\[= \frac{3c - 5 + 3 - 2c}{c^{2} - 4} =\]
\[= \frac{c + 2}{(c - 2)(c + 2)} = \frac{1}{c - 2};\]
\[c = - 3:\]
\[\frac{1}{- 3 - 2} = \frac{1}{- 5} = - 0,2.\]