Question 72500
((7x)/(4y^(3)) ÷ ((21x^(3)/(8y)) 

sol :: 2 / (3(x^2)(y^2))
 
((6x+6y)/(x-y)) ÷ ((18)/(5x-5y))

sol :: (5(x+y))/3.


((x^(2)/(x^(2)+2x+1)) ÷ ((3x)/(x^(2)-1))

sol :: (x-1)/(3(x+1).