Evaluate the given expression if y = 2/5 and z = 5/6
12y-z=?
Also Simplify the complex fraction of 
23k/12 divide 11/6 =?
I have not done these type of prblems yet and am uncertain on how to work and solve these as well. can you also help me with these?
I would greatly appreciate any and all help. Thanking you in advance.

 
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