Let's simplify the following fractions:

$$
\text { 1. } \frac{x^{3}+4 x^{2}+7 x+4}{x^{3}+2 x^{2}+x-4}, \quad 2 \cdot \frac{24 x^{3}+46 x^{2}+33 x+9}{24 x^{3}+10 x^{2}-9 x-9}
$$
$$
\text { 1. } \frac{x+1}{x-1} \quad 2. \quad \frac{4 x+3}{4 x-3}
$$

Number of solutions: 18.