The answer to the expression [2−||−23−2(−15)||]÷(−13) is 5/13.
In the question , 
the expression is given as 
=[2−||−23−2(−15)||]÷(−13)
Solving the terms inside [ ] , we have 
2*(-15) = -30
Substituting the value of 2*(-15) in the expression , we get 
=[2-||-23-(-30)||]÷(−13)
=[2−||−23+30||]÷(−13)   ....as -(-30) = 30 
Solving the terms inside the modulus ||  || , we get
=[2−||+7||]÷(−13)      ...as ||-23+30|| represents the modulus(norm) value ..
So ,Simplifying further , we get 
=[2−7]÷(−13)                ....as 2-7 = -5
=[-5]÷(−13)       ...as a÷b can be written as a/b
= -5/-13
writing the answer in the simplified form .
= 5/13 
Therefore , the answer to the expression [2−||−23−2(−15)||]÷(−13) is 5/13.
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