book Maths Puzzle Numerical Ability

I'm having problems grasping the concept and proceedure to solving algebraic equations, I'd appreciate it if you walk me step by step through an example equation, that I may grasp

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book Other Question

Here is another:
Solve for a s=1/2(a+b+c)
Please simplify this expression:
1/(6^(-1/3) + 5^(-13))