Appendix A - Basic Algebra Review - A Exercises - Page A-15: 68

$\frac{26}{11}$

Step 1: $\frac{25-13}{6+5}+2\cdot\frac{7}{11}$ Step 2: $\frac{12}{11}+(2\times\frac{7}{11})$ Step 3: $\frac{12}{11}+(\frac{14}{11})$ Step 4: Get a common denominator and simplify: $\frac{12+14}{11}$. Step 5: $\frac{12+14}{11}=\frac{26}{11}$