Question 369477
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Hi,
If I am understanding your question properly:
{{{(1/2) + (2/3)/(3/4)- (4/5)(5/6)}}}
Dividing by (3/4) is the same as Mulitplying by (4/3)
{{{(1/2) + (2/3)*(4/3)- (4/5)(5/6)}}} 
{{{(1/2) + (8/9)- (20/30)}}}
{{{(1/2) + (8/9)- (2/3)}}}
Need common denominators to perform the additions and subtractions properly
{{{(9/18) + (16/18)- (12/18)}}}
13/18