"Pass the Paper" Problems- Adding & Subtracting REs

Addition Problems
1.[math]\frac{5}{6a}+\frac{7}{4a}[/math]
2. [math]\frac{6}{x^2+4x+4}+\frac{5}{x+2}[/math]
3.[math]\frac{3x}{x-y}+\frac{4x}{y-x}[/math]
Extra Problem for Groups of 4
4.[math]\frac{3a+2}{a+b}+\frac{4}{2a+2b}[/math]
Subtraction Problems
1. [math]\frac{y}{y-9}-\frac{-9}{9-y}[/math]
2. [math]\frac{-4y}{y^2-4}-\frac{y}{y+2}[/math]
3. [math]\frac{m+3}{m^2-6m+9}-\frac{8m-24}{9-m^2}[/math]
Extra Problem for Groups of 4
4. [math]\frac{y-2}{y-4}-\frac{y-8}{y-4}[/math]

Information: "Pass the Paper" Problems- Adding & Subtracting REs