I tried to my best to type the fractions so I hope this 
makes sense. Can you help me solve this? 



The LCD of all the denominators is 

So put the LCD over 1  

 =  - 

On the left side you can cancel the 6 into the 36 and 
end up with

 =  - 

In the first term on the right you can cancel the 9 
into the 36 and end up with

 =  - 

In the last term on the right you can cancel both the 4 
into the 36 and the (n-1)'s and now you have just

 =  - 

Remove the parentheses by distributing:

 =  -   

 





Edwin