book Maths Puzzle Numerical Ability

Please simplify this expression:
1/(6^(-1/3) + 5^(-13))

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solve

4a-5b-c=-26
5a+b+2c=-5
2a+4b+c=6

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ALPHABET
+LETTERS
SCRABBLE Each letter stands for a digit. No two digits can equal the same digit. Find the corresponding digits for each letter to make this a correct