book Maths Puzzle Numerical Ability

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

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book Other Question

Evaluate the expression when a = -5, b = 16, and c = 7.

7b + 10/a - √b How can you solve an equations with one variable and two numbers if they have a neggative and positive signs.It will be oky if you give me an example of how to solve an equation.If it`s not a problem if you could show step by step please and thank you.