exam Maths Puzzle Numerical Ability

x-c^c+a=a

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can someone please explain how to do this??!?! I dont care for the answers I just want to understand how to deal with this!
thanks in advance..
Determine S20 for the arithmetic s
Decide whether the experiment is a binomial experiment. If it is not, explain why. Each week, a lottery player plays the Daily Three in the California lottery. The random variable is the number of times per year the player wins.