SOLUTION: i need to simplify: 
{ { {4/x-3/y / 9/y-10/x } } }
in this case, the middle "/" is the division sign
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Question 30710:  i need to simplify: 
{ { {4/x-3/y / 9/y-10/x } } }
in this case, the middle "/" is the division sign 
Answer by Nate(3500)   (Show Source): You can put this solution on YOUR website!
 (4/x-3/y) / (9/y-10/x) original
(xy)(4/x-3/y) / (xy)(9/y-10/x) multiply by lowest common denominator
(4y - 3x) / (9x - 10y) is your simplified answer! 
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