Question 596374
 
Divide and simplify: 

{{{((a-4)(a+3)/(a^2-a))/(2(a-4)/((a+3)(a-1)))}}}
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Invert the divisor and multiply.
Cancel whatever you can.
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It's an easy problem.  
If you show your efforts, someone will help and correct it if necessary.
Tutoring is not doing it for you.