Solve the following fraction addition and subtraction problems:

$$
\frac{2+3-2}{7}
$$

$$
\frac{5-2}{7} = \frac{3}{7}
$$
The simplified answer is $\boxed{\frac{3}{7}}$.

$$
\frac{2+4-7}{9}
$$

$$
\frac{6-7}{9} = \frac{-1}{9}
$$
The simplified answer is $\boxed{-\frac{1}{9}}$.

$$
\frac{7-5-3+8}{12}
$$

$$
\frac{2-3+8}{12} = \frac{-1+8}{12} = \frac{7}{12}
$$
The simplified answer is $\boxed{\frac{7}{12}}$.

$$
\frac{8+7-9}{10}
$$

$$
\frac{15-9}{10} = \frac{6}{10}
$$

$$
\frac{6 \div 2}{10 \div 2} = \frac{3}{5}
$$
The simplified answer is $\boxed{\frac{3}{5}}$.

$$
\frac{12-7-5+11}{15}
$$

$$
\frac{5-5+11}{15} = \frac{0+11}{15} = \frac{11}{15}
$$
The simplified answer is $\boxed{\frac{11}{15}}$.

$$
\frac{9-5-3+10}{8}
$$

$$
\frac{4-3+10}{8} = \frac{1+10}{8} = \frac{11}{8}
$$
The simplified answer is $\boxed{\frac{11}{8}}$.

$$
\frac{7-1}{9}
$$

$$
\frac{6}{9}
$$

$$
\frac{6 \div 3}{9 \div 3} = \frac{2}{3}
$$
The simplified answer is $\boxed{\frac{2}{3}}$.

$$
\frac{10-8+7-4}{15}
$$

$$
\frac{2+7-4}{15} = \frac{9-4}{15} = \frac{5}{15}
$$

$$
\frac{5 \div 5}{15 \div 5} = \frac{1}{3}
$$
The simplified answer is $\boxed{\frac{1}{3}}$.