\[x = 5:\]
\[9x^{2} + 3 \cdot (c + 2) - (3 - 2c) = 0\]
\[9 \cdot 25 + 3c + 6 - 3 + 2c = 0\]
\[5c + 225 + 3 = 0\]
\[5c = - 228\]
\[c = - \frac{228}{5} = - 45,3.\]
\[x_{2} = - 5.\]